kodi xbox-x bad resolution.

Good evening I’m new to this forum, kodi v20.1 on my xbox series x works quite well with audio: atmos, dts, dts-hd, true hd etc, I have very serious problems with videos, they all display 720p, 1080p and 4k but they are all played in terrible resolution.
it is present on all my films a lot of video noise and bad resolution, do you have a solution? thanks.