Windows 10 Insider Preview Dev Build 21354.1 (co_release) - April 7 Insider

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    Windows 10 Insider Preview Dev Build 21354.1 (co_release) - April 7

    Windows 10 Insider Preview Dev Build 21354.1 (co_release) - April 7

    Dev Channel (Fast ring)
    Category: Insider
    Last Updated: 20 Jun 2021 at 15:55

    UPDATE 4/14: Windows 10 Insider Preview Dev Build 21359.1 (co_release) - April 14

    Hello Windows Insiders, today we are releasing Windows 10 Insider Preview Build 21354 to Windows Insiders in the Dev Channel.

    Starting with today’s build, Windows Insiders will notice that the name of the branch we are releasing builds as shown on the desktop watermark at the lower right of the desktop from has changed to CO_RELEASE. Just like we did back in October when we released builds from the FE_RELEASE branch, we are practicing our ability to change which branch flight builds from. As our engineers work in development cycles internally, we may prioritize work being done in a specific branch and may need to move Insiders between branches. We are treating these builds the same as we would treat builds from the RS_PRERELEASE branch.

    What’s new in Build 21354

    New personalization options for news and interests on the taskbar

    Thanks for your continued feedback for news and interests on the Windows taskbar! We’re continuing to develop the experience based on your suggestions. Today, we’re pleased to announce a new set of features rolling out for personalizing the feed to suit your interests.

    Now, when you hover on the weather on your taskbar, you’ll see a new “Manage interests” button appear at the top of the window. This button links to a new full-page personalization experience, where you can choose the topics that you’re interested in. New users may also see a personalization card in their feed to help them get started.

    Use the search box at the top of the “My interests” page to search for the topics or publishers you want to follow. You can also discover interests by browsing over a dozen categories, including different types of news, entertainment, and sports topics. When you select a topic to follow, you’ll see more stories about it in your feed as stories become available. You can manage the topics you’re following by selecting “Followed interests” in the left navigation.

    We’re also excited to announce, “Tune your feed”, available from the left navigation on the “My interests” page. This experience makes it easy to explore and follow publishers from our partner ecosystem and select example articles that pique your interest. Select a couple of publishers and stories to get started or scroll to see more. You can see and manage the publishers you’re following by clicking “Followed Publishers” on the left navigation. You can also tune your feed wherever you see a story. Click the “X” on the top right of the card to remove the article and provide feedback: “Not interested in this story”, “Don’t like the source”, or “Report an issue”. We’ve refined this experience based on user feedback, to give you another way to fine-tune your feed for your preferences.

    These new personalization experiences are now available in several markets, including the U.S., U.K., Canada, India, and Australia, with global rollout continuing. We look forward to hearing what you think about these new options for personalizing news and interests!

    Reminder: We continue to roll out news and interests to Windows Insiders, so it isn’t available to everyone in the Dev Channel just yet.

    Improvements to Display Settings

    Content adaptive brightness control (CABC) disabling: CABC helps improve battery performance on PCs, but with the trade-off of decreased image quality. It can result in distracting brightness changes that interfere in experiences where image quality is of high importance such as for creative professionals looking for color accuracy. The ability to turn CABC off has been a highly requested feature and Windows Insiders can now disable CABC directly in the Display settings via Settings > System > Display.

    Note: Depending on your device, you may see just one (or both) of the checkboxes seen under the brightness slider below. To find out if your device has CABC support, you can look at your GPU control panel.

    HDR certification: To bring awareness to high quality HDR displays and educate customers, we are bringing HDR certification to Settings > System > Display under “Advanced display settings” with the latest Insider Preview builds. Under this settings page, a display’s HDR certifications will be shown.

    How to See HDR Certification of Display in Windows 10

    We will be rolling out this feature over time and are starting with select Dolby Vision and VESA DisplayHDR models, so please don’t be alarmed if in the Advanced display settings, you see that your display has no HDR certification even though it is certified.

    New Camera Settings page

    We are extremely excited to introduce a new Camera Settings page we’ve been working on, giving users the ability to add/remove cameras and configure the default image settings of each one.

    How to Enable or Disable Camera or Webcam in Settings in Windows 10

    This page allows you to manage cameras through the Settings app, whether they’re connected directly to the device (like a webcam) or are ONVIF IP cameras on your local network (for more info on ONVIF support in Windows, see this blog post). This new Settings page can be found at Settings > Devices > Camera. Each camera has a “Configure” button that lets you make changes to the default brightness and contrast – letting you get rid of the pesky backlight that always shadows your face in your video calls. Depending on what features are supported by your camera, you can configure brightness and contrast, enable Video HDR or Eye Contact, or correct for camera rotation.

    How to Change or Restore Default Image Settings for Camera in Windows 10

    We look forward to hearing your feedback about this new feature. Please try out the Configure default image settings for your camera Quest on Feedback Hub and then send us your feedback at the end – we’d love to hear what other features you’d like to see, and if you run into any issues with your specific PC, camera and/or video app.

    Inbox app updates

    MSPaint is now updated via the Microsoft Store:

    MSPaint is now updateable via the Microsoft Store outside major OS updates. It also has a new icon and has been promoted out of the Windows Accessories folder to its own place in the Start menu.

    Snipping Tool is now updated via the Microsoft Store:

    Snipping Tool is now updateable via the Microsoft Store outside major OS updates. It has been packaged together with Snip & Sketch so we can deliver updates for both at the same time. It has also been promoted out of the Windows Accessories folder to its own place in the Start menu.

    NOTE: Because we’re combining both Snip & Sketch and Snipping Tool, Insiders who previously did not have Snip & Sketch installed will see Snipping Tool removed after updating to this build and will have to go and install Snip & Sketch from the Store to get it back.

    Organizing all the admin and system tools under Windows Tools:

    In Build 21343, we announced we changed the name of the Windows Administrative Tools folder in Start to Windows Tools as part of an effort to better organize all the admin and system tools in Windows 10. In Build 21354, we are continuing that effort. The Windows Accessories, Windows Administrative Tools, Windows PowerShell, and Windows System folders have now been removed from Start and the apps within these folders can now be accessed via the Windows Tools entry point that directs to the full apps list in File Explorer. All these apps will still appear in via search, launch via any method, can be pinned to Start or taskbar, and any customized shortcuts in the folder paths will remain intact. Also, File Explorer has been moved into its own place in the Start menu as part of this work.

    Changes and Improvements

    • [News and interests] As mentioned previously, we have enabled the ability to deselect “Open on hover” in the “News and interests” taskbar options. This is based on your feedback.
    • The default path to access Linux files from Windows using the Windows Subsystem for Linux has been changed from `\\wsl\\` to `\\wsl.localhost\\` to improve performance and reliability. You will still be able to access Linux files using `\\wsl$\\`.
    • Under Settings > Update & Security > Change active hours, you will find the toggle turned on for “Automatically adjust active hours for this device based on activity”, if you have never adjusted this feature. We are starting a roll out a change for Insiders that makes this setting on by default. With this setting turned on, Windows Update will be able to schedule automatic restarts when you are typically not using your device more accurately.
    • As of the latest versions of Microsoft Edge, all pinned sites (regardless of what version you were using when you pinned them), should now use the taskbar behavior described here without you first having to unpin and re-pin the site.
    • On ARM64 devices, you can now toggle compatibility settings for x64 applications.
    • Under Settings > Personalization > Device usage, you can select all the ways you plan to use your device to get customized suggestions for tips, tools, and services.


    • [Gaming] We fixed an issue where certain games may crash, will not sync save data when a game is played on a different device, or will not save when a new game is installed.
    • [File Explorer] We fixed an issue resulting in all folders pinned to Quick Access in File Explorer disappearing if you installed Build 21343. Please note that this fix prevents the issue from occurring going forward, it will not bring back the ones that were unpinned if you installed the impacted build previously.
    • [File Explorer] We fixed an issue resulting in some Insiders experiencing that the entire folders section of Quick Access was missing after installing the previous flight.
    • We fixed an issue impacting Search reliability in the previous flight.
    • [News and interests] Fixed an issue where news and interests could occlude other content on the taskbar especially on smaller screens.
    • We fixed an issue where the tooltip text for items in Start’s Power button menu wasn’t displaying correctly.
    • We fixed an issue resulting in a crash if you entered WinPE and tried to enable Narrator using WIN + CTRL + Enter.
    • We fixed an issue resulting in some Insiders experiencing a bug check with error SYSTEM_THREAD_EXCEPTION_NOT_HANDLED when rebooting or shutting down in the previous flight.
    • We fixed an issue that could result in a bugcheck when starting WSL.
    • We fixed an issue that could result in the Windows Update Settings page showing progress dots but never loading.
    • We fixed an issue where navigating to Power and Sleep in Settings would crash Settings.
    • We fixed the issue where a random toggle that didn’t do anything was appearing under Settings > Personalization > Lock screen.
    • We fixed an error resulting in some Insiders recently seeing an error when trying to add a password to a local account that was created without a password.
    • We fixed an issue where if you opened the Pinyin IME settings via Search, the Settings page would be unexpectedly blank.
    • We fixed an issue that could result in your desktop background going black after snapping an app to the side of your screen.
    • We fixed an issue where some of the text in Snipping Tool wasn’t displaying correctly.
    • We fixed an issue causing the Handwriting Input Panel to not work for pen input on ARM64 PCs.
    • We fixed an issue impacting clipboard history reliability.
    • We fixed an issue resulting in characters being duplicated in certain apps when typing with the Korean IME.
    • We fixed an issue resulting in not being able to insert composition strings when typing with an IME after copying and pasting a text box in PowerPoint.
    • We fixed an issue resulting in key events being lost when renaming files in File Explorer while typing with an IME.
    • We fixed an issue where when typing with the Japanese or Chinese IMEs in certain apps that have their own UI for IME candidates, the IME candidates were not displayed in the app’s UI.
    • The fix we mentioned in Build 21327 to address an issue where a toggled key on the touch keyboard had the wrong background color is now rolling out to all Insiders in the Dev Channel.
    • We fixed an issue causing an increase in login time in the previous flight.
    • We fixed an issue resulting in some Insiders finding that boot time was longer in the previous flighting.
    • We fixed an issue resulting in the network button on the login screen not working and potentially crashing.
    • We fixed an issue causing some logins to hang on a black screen. If you continue to see a similar problem, please file a new feedback in Feedback Hub.
    • We fixed an issue that could result in freezes when watching videos in Chromium-based browsers in recent Dev Channel builds.

    Known issues

    • We’re looking into reports of the update process hanging for extended periods of time when attempting to install a new build.
    • [News and interests] Pressing ESC key to dismiss an opened context menu in the flyout dismisses the whole flyout instead.
    • [News and interests] Sometimes the news and interests flyout cannot be dismissed with pen.
    • [ARM64] Insiders who installed the preview version of the Qualcomm Adreno graphics driver on the Surface Pro X may experience reduced brightness of the display. This issue is fixed with an updated version of the preview graphics driver at If you are experiencing this issue, please see the feedback collection for more information.
    • We’re investigating an issue where elements of Search (including the search box in File Explorer) are no longer displaying correctly in dark theme.
    • We’re working on a fix for an issue introduced in the previous flight impacting WSUS users where the “Check online for updates from Microsoft Update” option is greyed out. If you are impacted, you can run the following command from an elevated Command Prompt to set the reg key so that scan will check Microsoft servers:
      • reg add “HKLM\Software\Microsoft\WindowsUpdate\UX\Settings” /f /v ScanMicrosoftOnly /t REG_DWORD /d 0x01

    Then click the regular “Check for updates” button in Windows Update Settings. Please note, if the scan needs to be done repeatedly the reg key will need to be re-added each time, as scanning reads and erases the key.

    • Due to an issue with migrating the shortcuts into the new Windows Tools location, This PC shows up with the display name “computer.” We already have a bug fix on the way to address this issue.
    • Some non-administrative apps, such as 3D Viewer and Print 3D, that were previously in the Windows Accessories folder are now in Windows Tools. These app shortcuts will be moved back into Start with an upcoming bug fix. They are still searchable and accessible via Windows Tools in the meantime.
    • The Windows Camera App currently does not respect the default brightness setting set via the new Camera Settings page.
    • Some cameras currently may not support adjustment in the Camera Settings App when the camera is also in use by another app.
    • Accessing the virtual GPU is broken for Windows and Linux guests, adding a vGPU to a VM will have no effect and the VM will continue running with software rendering.

    Important Insider Links

    You can check out our Windows Insider Program documentation here, including a list of all the new features and updates released in builds so far. Are you not seeing any of the features listed for this build? Check your Windows Insider Settings to make sure you’re in the Dev Channel. Submit feedback here to let us know if things weren’t working the way you expected.

    If you want a complete look at what build is in which Insider channel, head over to Flight Hub. Please note, there will be a slight delay between when a build is flighted and when Flight Hub is updated.


    (Amanda is enjoying some much-needed time off this week!)


    Microsoft has released an ISO file for Windows 10 Insider Preview version 2004 build 21354 for the Dev Channel (Fast ring). :-)

    See: Download Windows 10 ISO File

    Brink's Avatar Posted By: Brink
    07 Apr 2021

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    kado897 said:

    what's _co release?
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    FYI UUP is now (or was before but not for me) .net
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    Windows 10 Insider Preview Dev Build 21354.1 (co_release) - April 7-co-release.png
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    Installing on both test machines: 54% on the X380 Yoga, and 22% on the X220 Tablet. We're off! I'll report back if anything odd or unusual pops up, but I'm not expecting such. Let's hope I'm not surprised!
    [Note added 20 hrs later] On my Lenovo X380 Yoga, I had issues with Explorer, Taskbar, and voidtools Everything on initial desktop (extremely slow, nonresponsive warning in app titlebar). Another reboot fixed that pronto. No such issues on the Lenovo X220 Tablet, though. Weird: go figure!
    Last edited by EdTittel; 08 Apr 2021 at 10:19.
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    Windows 10 Insider Preview Dev Build 21354.1 (co_release) - April 7-21354.jpg Windows 10 Insider Preview Dev Build 21354.1 (co_release) - April 7-winver.png
    Last edited by Brink; 10 Apr 2021 at 10:55.
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    AndreTen said:

    what's _co release?
    Will eventually become 21H2 I think.
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    AndreTen said:

    what's _co release?
    First paragraph in the main post, they are playing with release levels again.
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