Sets EnableAeroPeek = 0 under Software\Microsoft\Windows\DWM. Turns off the desktop-preview effect where hovering the far-right 'Show desktop' nub (or Alt-Tab) fades all windows to glass to reveal the desktop. Removes a small continuous DWM compositing cost and the hover delay. Minimise-all via the click still works. Reversible.
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/dwm/composition-ovw