Not sure why the author didn't say this, but that's _by default_. There's a search in the top right and you can do like `astro-ph` and it'll return papers from it, afaict by skimming the source.
IMO it should show that it's searching cs / ai as prefilled search terms.
Noted, I'll add it now
Added!
Yeah, I filtered it mandatorily about AI or computer science