> I see you seem to be passing some info from vim to tmux right bottom bar, the utf8 the encoding. In vim, I usually show my offset in the file there.

The bottom bar is rendered by Vim with lightline [1]. The top bar is my tmux statusline, which I created by lightly customizing the output of tmuxline.vim [2].

I made my tmux.conf by customizing what I found on github, in particular @junegunn's dotfiles [3].

[1] https://github.com/itchyny/lightline.vim

[2] https://github.com/edkolev/tmuxline.vim

[3] https://github.com/junegunn/dotfiles