Resize A tmux Window Split Pane On A Mac

The Easy Way: With The Mouse

Add this to your `~/.tmux.conf`` file to let tmux work with the mouse:

Code

setw -g mouse on

Start a new session, make a new split with either `LEADER-%`` or `LEADER-"`` then drag when divider to resize the panes.

TL;DR With Commands

CTRL-b
ESC-arrow_key

Details

Hit the leader key (which defaults to CTRLb) then hold the OPTION key and press the ARROW of the direction to push the window

References