Sets GlobalUserDisabled = 1 so packaged (Store/UWP) apps cannot keep themselves alive in the background. Frees the RAM and CPU those background instances consume at idle. Win32 desktop programs are unaffected. Trade-off: some Store apps won't deliver live-tile or notification updates until opened.
MaxTweaks applies this tweak with one click and snapshots your original setting first, so you can revert it cleanly at any time. A System Restore point is offered before batch changes, and every tweak links to its official source.
Get MaxTweaksOfficial documentation: https://learn.microsoft.com/en-us/windows/uwp/launch-resume/run-in-the-background-indefinetly