The option for swapping between panes is only available through the menu button but I can't see any action to bind to this action. Is there and in built command that allows to swap panes?
Correction for the second part of the selected answer:
If you mean swapping the positions of the panes, it can only be done from the right-click menu:
- Right-click pane to swap from, it turns red
- Click on pane to swap to There is no keyboard shortcut for this according to gitlab issue
You can set it on your own.
Go to iTerm2->Prefrences->Keys.
On the bottom you will find a plus sign - press it to add a keyboard shortcut.
You can choose from a variety of actions - including "swap position with split screen".