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Did you go into File and Folder options and make sure that you did not change the setting for icons to not show images. Along with enabling check marks.
Yes have checked that but here is the funny thing in some folders some pictures display some display as an icon, its all screwed up which makes picking screenshots difficult.
Maybe the app you have associated picture files with causing the problem.
Associate picture files with Windows Photo Viewer and see this will resolve the issue.
This is the tutorial for Thumbnail Preview. Enable or Disable Thumbnail Previews in File Explorer in Windows 10 Customization Tutorials You are supposed to just be able to do it from the ribbon.
Forget about the troubleshooter, you are going to have to go and do it the old school way. This is because for some reason the thumbnail cache is messed up, which requires going in and doing a cleanup, along with following the tutorial. It is really straightforward, that if all else fails, you do a rollback in system restore.
I have already deleted the databases and that hasn't helped a rollback is not an option.
A System Restore or non-volatile rollback, are your only two options. Something that you were doing, caused this. If in Files and Folders in the Control Panel does not work under the Themes section, you are going to have to try and show in detail, when it started, where you doing something and caused this, are you running any kind of third party software.
I have gotten to the point that I do not carry any documents and such on my MacBook Air, same as the Lenovo in our back room for doing somethings on windows. All of my stuff is kept on a NAS and in icloud.