not OP but I'm here to confirm the Android version of Krita really sucks ass, especially on phones. It's a direct port of the desktop version, windows and all, and if a window is too big to fit on the screen, tough luck. switch back to portrait and hope it works there. Krita is also very CPU bound and on my Pixel 7a there is almost a full second of lag between my stylus on the screen and the line I drew actually showing up.