How to convert 2 horizontal panes to vertical panes in tmux?

After doing join-pane on 2 windows, you have 2 horizontal panes. How do I rearrange the panes to be vertical panes instead?

Solution 1:

C-b space (bound to next-layout by default) cycles through available layouts, you can also use the select-layout command.

M-1 to M-5  Arrange panes in one of the five preset layouts: even-
            horizontal, even-vertical, main-horizontal, main-
            vertical, or tiled.

On OS X, M is Esc, i.e. Ctrl-b Esc-1.

See man tmux for more details.

Solution 2:

In Mac OS Yosemite, this works:

Prefix + Option-[1-5]

e.g: Ctrl-b Option-1

Solution 3:

You should be able to use:

ctrl-b meta-2

to do this, but I'm unable to test it since OS X doesn't like anything too "meta" (we have at least that in common).

Source: http://hyperpolyglot.org/multiplexers