Please note: All credit goes to GosuDRM !
This is a fix for pillarboxing in cutscenes with ultrawide/wider displays.
Grab the latest release of HogwartsLegacyFix from here.
Extract the contents of the release zip in to the game directory.
- steamapps\common\Hogwarts Legacy
See HogwartsLegacyFix.ini to adjust settings for the fix.