The Explore button is always meant to start a new search, e.g. when you see it on a taxon screen, it’s meant to show you observations of that taxon, not to take you back in your navigation history. It is a bit confusing that you can have multiple “instances” of Explore in your navigation history, but we feel doing the opposite, as your requesting, might be even more confusing, e.g. you’re in Explore, you view an observation, you tap on a taxon, and you tap the Explore button and you jump all the way back to Explore with your previous filters set.
Thx for discussing my idea.
Though I still would prefer what I proposed I think whe can leave it there, essentially as there is no support from the community.