I’m not sure you actually can. Maybe it works with some kind of URL manipulation, but I’m not aware of a way. The UI is a bit deceiving in this use case. You can search in identify for an observation without the “Leaves” annotation. But if you try to choose a value, it does not stick or update the numbers queried.
You can see the relevant thread here: https://forum.inaturalist.org/t/identify-filter-without-annotation-not-working-properly/30148