Hi, I don’t know why I have notified that frame generator option in menu missing, i have a Rtx 4090, i have installed and reinstalled nvidia driver but nothing to do , how i can fix it ?
Your topic has been moved to the User Support Hub > Install, Performance & Graphics category as this is the most appropriate for your issue. Please look through the categories we have available to find the most appropriate one in the future, as posting in the Official Microsoft Flight Simulator > Forum Navigation category is not permitted or relevant.
Thanks
The MSFS Team 
This same issue happened to me a couple weeks ago. In my case HAGS (hardware accelerated GPU scheduling) got turned off. It’s a setting in the Windows OS, not the simulator. Just Google it to find out how to check based on your Windows version.
Edit: Yeah, the above screen shot, lol. That post didn’t show up when I replied. No idea why.
Additionally to HAGS On you need to run the sim in DX12. Else no Frame Gen.
Kinda difficult to use anything other than DX12 for MSFS 2024.
sorry, havent noticed this is tagged for msfs2024.
my bad.
Cheers