Here's a feature that is not so obvious in #MastodonBirdUI ('Elephant' theme on mstdn.social): Swipe-enabled bottom bar on mobile.
I really like the links to be on bottom of the screen on mobile to save the screen estate, but there is just no way for them to fit horizontally. However, you can touch-scroll through them. If you use gestures like me it might need a stable hand, but there is no alternative yet.
https://github.com/ronilaukkarinen/mastodon-bird-ui/issues/26
https://github.com/ronilaukkarinen/mastodon-bird-ui/issues/33