In Thunderbird for Android's mail list view you have some options to sort the mails in the list, using the icon left to the three dot menu on the top right.
But you can't see the currently active sort option there. So in some cases you can't see the difference between "Sort by date" and "Sort by read/unread" when all unread mails are new ones.
When toggling the sort options you sometimes have to try to find out which option is active: "by date" or "by read/unread". Only to find out that the sorting already was correct and has to be reverted.
Same for all other sort options; you never know exactly what is currently in action.
Idea:
My app version by the way: Thunderbird for Android 13.0b1