Ok, that worked! Unfortunately, it didn’t solve my problem with the table that is no longer responsive, but I might just have messed sth. up in the settings.
If you have a quick idea about that I’d like to hear it, but aside from that I’ll declare this threat as “solved”.
Thanks for your help and patience, David!
***Edit***
Now the pages are responsive again. Loading the page, it starts out non-responsive (table much longer than content, therefore lots of white space on the right side), but after a few seconds it gets into “normal” mode again. Never seen anything like this. Sorry, for the confusion.