' splits across the pane, and it’s on the middle row if you ignore the function keys.

After detaching, you can run tmux ls to see all the tmux windows that are currently running. After doing this you will be back to your normal terminal. % splits the pane down the middle, and it’s located in the middleish of the keyboard, almost splitting the two halves from each other. You can leave a tmux window but keep it running in the background by detaching the window with the command ctrl+b followed by d. So if it’s not visual, what’s the mnemonic for these defaults? % kind of looks like two panes side by side, though it could also just be two panes stacked ' would definitely be two panes side-by-side, though. These make more sense at first glance: | and _ look more like the end result more than % and ' do. It seems a common remapping is to change these to Ctrl-b | for vertical, and Ctrl-b - (or Ctrl-b _, or both) for horizontal.

A horizontal split (one pane on top, one pane on the bottom) is Ctrl-b '. While trying to fall asleep, I ended up thinking about the key combinations used to create splits inīy default, you use Ctrl-b % to create a vertical split (i.e.

Tmux vertical split