The demo only has windowed mode and windowed borderless mode as options, no true fullscreen. This causes the game to use vsync regardless of the in-game option (since it passes through DWM) and introduces unnecessary input lag when you look around.

I tried to force the setting via the INI file but the game seems to ignore it and reset it back to windowed fullscreen no matter what.

Final game doesn't have fullscreen and is stuck at 1080p which is unacceptable. Also apparently if you enable ray tracing it runs horrible even on a 3080 with DLSS enabled. The game will be at 70fps then drop to 14fps for no reason...like you're looking at the same thing and the fps just tanks

Change the Window Mode to "Windowed" and you'll be able to change the resolution.

A patch is coming, they posted this on steam:

[i]To all of the Runners here:

My team of humans is working on adding the fullscreen option in an upcoming fix.
There were some issues, and for now, the team has decided to remove the fullscreen option for the sake of a better experience

They're very sorry for the inconvenience, and they will do their best to bring it back ASAP. [/i]