Hello,am i alone got this problem? on main menu fullscreen perfect no lines but just go ingame and half sceen turns into black lines on top and bottom :/ i got 1440x900 screen got this problem after 0.17.7 update i think
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1440x900 is a 16:10 resolution and CK is rendered out in 16:9, which would account for the black bars (though not sure why the main menu is rendering fine).
Unfortunately, Ren'py isn't a 3D game engine so adjustable resolutions aren't really possible. Best I can advise is to use windowed mode and then just manually expand the screen size by clicking and dragging on the corners or the window.