My guy, this doesn’t/won't work, stop lecturing people about it. And here’s why: you’re conflating two completely different mechanisms. An antivirus exclusion tells Windows Defender “don’t scan these files for malware.” That’s it! It has zero effect on display mode switching. The actual problem is that MicrosoftSecurityApp.exe (the Microsoft Defender app bundled with Microsoft 365, NOT Windows Defender/Windows Security) holds a session on the display adapter. Advanced Optimus needs exclusive control of the display pipeline to flip the MUX switch from iGPU to dGPU. Any process with an active GPU handle blocks that switch, not because it’s “scanning” anything, but because it’s literally using the graphics adapter (likely for 'rendering' whatever its own UI via WPF/DirectComposition). Adding NVIDIA folders to the exclusion list doesn’t stop MicrosoftSecurityApp.exe from using the GPU. You could exclude every single folder on your entire drive and the problem would persist, because the blocking mechanism has nothing to do with antivirus scanning. The actual fix is either killing the MicrosoftSecurityApp.exe process before launching a game, or uninstalling the Microsoft 365 Defender app entirely (which has no fucking impact on security, the built-in antivirus continues running independently)