Hi Diana - my understanding is that post content discovery you can unapprove content for predictive content, so it no longer is accessible to the predictive content engine and disappears from the content page.
So everything is discovered, but you can manually tell Predictive Content what to ignore.
Is that what you're looking for?
I had found that function but was hoping for something similar to the URL patterns used for discovery, but for exclusion rather than inclusion. I've now got nearly 500 pieces of content, most of which are property listings for residential (Marketo and RTP is commercial property only) - it's going to be a very big job to 'undiscover' them, and I'll need to do it continually as new residential listings are constantly being added to the website. The added frustration is that it often isn't entirely clear what the content acutally is, as the way they've been named by the teams is very inconsistent - I have videos called '80 Wardstay Road', and videos called '216650963' - I have to view each piece of content before I can confidently remove it.
In an ideal world, I'd be able to exclude anything with a URL preceded by /residential/ or /rural/ - I think it may be a manual process for now!
Use the search box in Predictive content TAB for this purpose. If you use search by specific pattern like /residential/ or /rural/ then it will show you only the assets/content which has this pattern in the URL and then you can select all and unapprove these content pieces in the one go.
I think this is the only way to un-approve multiple content pieces from showing up as predictive content.