Take a look at these previous posts:
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https://forum.inaturalist.org/t/filter-or-sort-by-taxonomic-hierarchy-in-collection-projects/3067/2
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https://forum.inaturalist.org/t/implement-taxonomic-view-for-observations-search-page/244/6
I think I found the/a workaround of sorts:
Replace the 1726 with the number of whatever project you’re interested in (1726 is ID of a project I run in SE Asia).
This seems to give a taxonomic view, but it appears to be incomplete. It should return 2026 taxa, but only returns 210. Maybe there is a limit placed on the returns?
And doesn’t have the same extra features as the lifelist view does (eg, no sidebar with images and such)