Hi Dominic23,
something very interesting I noticed. Yesterday I turned ON Content and Privacy Restrictions (system preferences > Screen Time > Content & Privacy) because I got a pop-up survey from dope-news.xyz, which I think is a virus or related to a virus. So I blocked this site.
What is interesting is that if I have turned ON content and privacy restrictions in Screen Time, the Manage Website Data in Safari (Safari > Preferences > Privacy > Manage Website Data) does not work (does not remove websites). But if I have Content & Privacy Restrictions turned OFF in Screen Time, the Safari Manage Website Data works fine, it removes websites.
So I don't know what is the relation between Screen Time and Safari website data, but this is the way it works.
Now, I would like to have Content & Privacy Restrictions turned ON in Screen Time, and at the same time being able to manage website data in Safari. But maybe this is a bug that Apple may want to fix (soon). What do you think?