I have a samsung M34 with latest one ui6.1 recently my display has this pink/red tint on it which makes everything look really bad. I tried some online fixes I found like changing display mode from vivid to natural, changing stuff in vision enhancements, changing time to morning and changing colour palette. None of these seem to work. An old fix which used to work by using nova launcher and launching the night light activity does not work on one ui 6.1 as the night light activity is missing on the launcher.
