This has been a feature request for at least six years. See here:
https://forum.inaturalist.org/t/toggle-obscured-observations-on-off-on-maps/420
It’s nice that there is a url option, which I didn’t know about or forgot about, but such a basic feature that most people probably want should be easily accessible from the relevant webpages and not just by using an iNat cheat code hidden away on the URL modifier page where most people will never see it.