I have my tablet area set as full but it doesn't work properly in osu sometimes it just uses the left half of my tablet or a way smaller area the full area works fine when its out of osu. Also im not sure if this is related but osu says my native resolution is 3840x2160 instead of 1920x1080. Reinstalling the game fixes the problem but it goes back to doing this after some time ( it still says 3840x2160 when I reinstall but the area problem gets fixed). I used this same tablet and it used to work fine, but recently this started happening without me changing the settings or anything.
https://imgur.com/a/5nnwODN
https://imgur.com/a/5nnwODN