How to turn off the GeForce Experience in-game overlay (Alt + Z)
Disabling the GeForce Experience Share In-game Overlay | NVIDIA
NVIDIA Performance Overlay for GeForce Experience - Tutorial - YouTube
The Game Tips And More Blog: Quick Tip: NVIDIA 'In Game Overlay' Stopped Working? Here's How To At Least Get It Going Again [Fix / Workaround That Might Work For Some, Updated 2018-04-26]
Nvidia Geforce Experience: Overlay deaktivieren - so geht's - CHIP