After changing the database prefix on my site as recommended by Defender the entire site crashed. Contacted hosting and they were able to put the site back on but, several options appear to be missing there even for site admin.
There are options like adding new user, installing new plugins and deleting exiting one. Also, the user role seems to be messed up on the site. Role is either admin or none.
Hosting reinstalled WordPress core files but checking the database, there are some tables with the old prefix. And a couple of them appear duplicated.