None of my games use Fullscreen Optimizations in Windows 10

Hi,

What games are crashing? Some, or all of them?

Games from the Windows Store (or Game Pass) either have Fullscreen Optimization enabled by default or run in Windowed Borderless mode which shouldn't cause games to crash when attempting to ALT+TAB.

You can check whether Fullscreen Optimizations are enabled or not by opening the Xbox Game Bar via Win+G. If you are running in Fullscreen Exclusive, then the display brightness may be flicker. If you are in Fullscreen Optimizations, the Xbox Game Bar should pop up as an overlay.

Sounds more like a graphics driver issue to me.

Windows Apps can not have Fullscreen Optimization disabled as it's not possible to access their exe file to disable them.

im on fullscreen, like i said it only happens on my windows 10 games. steam games for example are fine

Hello, I'm Felipe and I'm an independent Community Advisor, and I'll do my best to help you.

There are a few things you can try to solve the Minecraft Windows 10 Edition closing problem:

Update your graphics driver: Make sure your graphics driver is up-to-date. Outdated graphics drivers can cause issues with Minecraft.

Run the game as an administrator: Right-click on the Minecraft app icon and select "Run as administrator". This can sometimes solve issues with apps closing unexpectedly.

Disable fullscreen optimizations: Right-click on the Minecraft app icon and select "Properties". Click on the "Compatibility" tab and check the box that says "Disable fullscreen optimizations".

Reset the app: Go to Settings > Apps > Apps & features. Find Minecraft on the list and click on it. Click on the "Advanced options" link and then click on the "Reset" button.

Reinstall the app: If none of the above solutions work, try uninstalling and then reinstalling the Minecraft app. Make sure to back up any saved games or worlds before doing so.

If the problem persists, you may want to contact Minecraft support for further assistance.

thanks for your assistance
figured it out had to change compatibility options to disable Fullscreen optimization

Currently, Windows 10 doesn't have official support for making a copy or backup of downloaded Store apps and games for use on another device. The closest official feature is

Delivery Optimization which lets you download the app or game from another computer on your local network; see if that feature is suitable for your needs.