How to get vertical split on Mac OS X in byobu?
Ctrl + F2 is not working. It open new window instead of spliting the current.
In oposite spliting horizontaly with shift + F2 works ok.
You can use screen escape key to do that:
Ctrl + A and then % for vertical split or | for horizontal split.
For whole list: Ctrl + A and after that ?.
Ctrl + F2 is associated to Mac shortcut 'Move focus to the menu bar'. That might be why it is not working for you.
You can also use shift + the arrow keys.
Reported this issue on tmux repo and they have helped me to found a pretty slick fix. Click on Settings -> Profiles -> Keys -> Key mappings -> presets... -> xTerm Defaults and click on Keep.
Also click on Keep if this appears
THANKS A LOT @nicm at github