Only occurs when the display scale is above 200% in the system display settings.
1. Open any project.
2. In the Game window, set Enter Play Mode option to a Fullscreen option on a 4k display with scale above 200%.
3. Enter Play Mode.

Expected result: Game view fills the screen selected.
Actual result: Game view partially fills the screen.

Reproducible in: 2022.2.0a2, 2022.1.0a16
Could not find a Fullscreen Play Mode option in 2022.1.0a15 or any other editor streams - marking as not a regression.

Notes
- Tested on Windows 10.
- No issue if display scale of the 4k screen is set to 200% or below in the system's display settings.
-Could not reproduce on Windows 10.