I’m on Windows 11.
I think I found the answer to the question myself but I want to make sure that’s actually the right way to do it so that I don’t mess anything up.
So, if I understand it correctly I can just replace the
[SYSTEMDRIVE]:\Users\[MY USERNAME]\AppData\Roaming\Nextcloud with the default one from
[SYSTEMDRIVE]:\Program Files\Nextcloud, right?