macOS Screenshot thumbnail bug and how to fix it

There is a long-standing multi-version bug in macOS that randomly resets the “Show Floating Thumbnail” option for screengrabs and it has understandably driven some people mad (including myself). You can set it to your preference all you want, but macOS will randomly decide to reset it back to SHOW floating thumbnail which adds a few seconds before the file is available on your desktop (or saved area).

To combat this, it seems like the only solution is to lock the plist file under your User folder.

Navigate to: (~/Library/Preferences/com.apple.screencapture.plist), click Get Info, and then lock the file so even macOS can’t make any changes to it. Worked for me!