Wanted to check out UE5, downloaded, installed, launched, created a basic project - and getting this terrible flickering, rendering the whole thing unusable: https://youtu.be/NGHQK25mXYo
Computer: Windows 11 with all the updates, NVidia RTX-3090 with driver version 512.59, Intel i9-11900K, 3xM.2 SSD drives, LG CX 77" TV as the monitor.
This happens generally in UE5 and UE4. You do not need to uninstall and install stuff again. That will happen in future. On nvidia, overlay test mode creates this issue.
Please run attached reg, in your registry file. Problem will be solved.
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Dwm]
"OverlayTestMode"=dword:00000005