lemmy app with multisub feature
Seems like it's even more important here than on reddit. As some communities have multiples on different instances like the aww communities has 3 so far.
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Liftoff (Android) has an option to show All from multiple signed on accounts simultaneously. That might be worth checking out.
It's under active development of course and I did find it in Google Play after searching by name ("Liftoff") and scrolling down.