The ability to collapse subtags under the parent tag on the mobile app
It would be super helpful if you could collapse all subtags under the parent tag on mobile. If you have a lot of tags it takes a lot of scrolling to be able to get through them all to get to a tag group that's listed closer to the bottom
Highlight row when swiping back from a message on mobile
Similar to the native mail app on the iPhone, it would be great to gray the conversation you just returned from. It’s subtle, but very helpful. I have put a screenshot here to illustrate this better.