I'm configuring a new Win10 laptop. Initially, the laptop and my desktop (also Win10) could see each other under the Computer section under Network in File Explorer. This is over a hardwired Ethernet connection via a switch. I started copying a bunch of files from the desktop to the laptop (to a properly shared folder, via Sync Toy) and went to bed. This morning, I confirmed all the files had been copied, and the laptop can still see the desktop, but the desktop no longer sees the laptop, even after restarting the laptop. Any tips on how to get the desktop to see the laptop again?

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After restarting the desktop, the laptop become visible. Problem solved.