I recently discovered display-popup that was added to newer versions of tmux. There's a ton of cool things you can use it for, one being to create a help/cheatsheet popup window with common shortcuts:
# Custom help display (replaces default ? binding)
bind-key ? display-popup -E -w 90% -h 80% "echo 'TMUX SHORTCUTS:
Window/Session Management:
ctrl+a w/W - fzf window switcher popup
ctrl+a s/S - fzf session switcher popup
ctrl+a \" - choose window (interactive)
ctrl+a ctrl+a - switch to last active window
ctrl+a , - rename current window
... more stuff here ...
' | less"
From tmux manual:
display-popup ...
Display a popup running shell-command (or default-command
when omitted) on target-client. A popup is a rectangular
box drawn over the top of any panes. Panes are not
updated while a popup is present.
Result
Ends up looking like this after pressing ctrl+a ? in my config:
It's been pretty helpful for me because I've also been trying out some other changes to my tmux config and don't always remember what keys are bound to what.