fwiw, if youre in tmux you can hit <prefix>-?, so for me it's ctrl+w+? and itll show all available tmux commands.

ctrl-w is a very commonly used key to control vim windows. How do you manage with that? I have my tmux leader key mapped to ctrl-z as we hardly use it these days.

I'm using ctrl+b (xfce-terminal) but also don't use vim