Is it possible to bring back the old layout? That the mayor buttons are in the bottom of screen? And how to mark messages as unread and spam now? Anyhow, why is less functionality in this version as in the one before the big release?
All of these questions have been answered so many times in so many different threads already, I’m sure you can find them if you look
The maintainer of this project is anti user and will not change the UI against theirs and google vision.
I suggest you check out FairEmail and see if it’s customization options satisfy what you are missing from the new K-9. It is also open source.