Sets GameDVR_DXGIHonorFSEWindowsCompatible = 1, the third member of the Fullscreen-Optimizations override trio. Ensures the DXGI present path respects the exclusive-fullscreen request so DX9/10/11 titles take the true fullscreen swapchain, removing one frame of compositor latency and Alt-Tab stutter. Safe; pair with the two FSE tweaks above.
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/win32/direct3darticles/dxgi-best-practices