Re: BF1 not displaying properly in full screen mode
The Samsung Odyssey G5 doesn't really have a bright enough screen to support HDR. A monitor needs around 600cd/m2 of peak brightness, or more, to properly display HDR colors. The Samsung Odyssey G5 maxes out at 300cd/m2 peak brightness.
Battlefield 1 also suffers from a HDR bug, which causes the HDR option in BF1 video options to say it's turned off, but really it's still turned on.
Instructions to turn off HDR in battlefield 1:
- Turn HDR off in battlefield 1 video settings
- close battlefield 1
- relaunch battlefield 1
If the contrast still looks wrong, keep closing and relaunching Battlefield 1 until HDR is actually turned off. The menu bug says HDR is off, when it actually isn't.
HDR doesn't work in windowed mode, which is why the game looks better in windowed mode. Eventually you can turn HDR off for full screen mode too. Just keep repeating the above steps over and over again until HDR actually shuts off and your game looks normal like it does in windowed mode.
PS: You probably just need to turn HDR off once, then just keep closing and relaunching the game until the setting takes hold and 'sticks'.