When I start the game, it’s normal.
But when I try to drag the window in any way a black border appears.
How do I fix this?
What version of GDevelop are you using, and on what platform (OS)?
Isn’t a unscaled resolution game?
See in project manager → Properties → Game resolution resize mode
Sorry for the late response.
Im on GDevelop 5.0.0-beta108, im also on Windows 10.