How to: Full screen mode.

[Patrick]

1: Download app: https://store.steampowered.com/app/388080/Borderless_Gaming/
2: Launch game
3. Add GunboundM app to favorites from the application.
4: Wait a few seconds, and the game will go in full screen.

EDIT: I do have some scaling issues. Trying to figure that one out as well.

[SantiiRepair]

Buying that is a pointless waste of money, every game should have an accessible fullscreen option

[Quagy]

go to settings menu and pick your RESOLUTION SIZE.