Excluding individual observers is pretty easy, though if the list of observers you want to exclude becomes long, then so will the URL you have to use.
You can apply all kinds of filters by editing the URL. I have a URL bookmarked for my identification sessions. It includes a number of filtering criteria that make my life easier. Among the things I exclude are a number of observers who have annoyed me over the years, a project that tends to generate a lot of “junk” observations, as well as observations that don’t meet a number of (my) other criteria for being “useful” .
You can find a fairly comprehensive guide on editing URLs here:
https://forum.inaturalist.org/t/how-to-use-inaturalists-search-urls-wiki-part-1-of-2/63
It’s pretty easy to figure out whether you’re doing it right or not. I find that most of the time if I get it wrong, it has no effect (ie. the observations I’m trying to exclude are still there on the identify page). So I keep trying until I see that the observations I want to exclude are not showing up on my Identify screen.