With byobu-screen the default status line had two lines. With byobu-tmux however the default status line only has one line. I liked the seperate line with the list of windows, it let me see more than one window title in a smaller terminal window.
Is it possible to have a multi line status while running on tmux?
Not easily, no. Unfortunately, tmux only supports a single status line at a time. That's a function of tmux, and not byobu.
What you can do, however, is configure multiple status lines and cycle through them using shift-F5. You'll only be able to see one at a time, but you can cycle through them with a single keystroke.
You can define and customize these in your
~/.byobu/status
file. Here's a snippet: