Horizontal dual layout: How to activate the second display?

Hi everyone,
I use the horizontal dual layout. I would like to know if there is any shortcut that activates the second display of this mode? I know there is a toggle, when you click on the bottom of the layout but I need a shortcut. It would be much easier

If you turn on Preferences / File Displays / Options / Use Tab key to switch source/destination in dual-display Listers you can use the tab key.

Alternatively, if you don't want to change what the Tab key does, bind a Lister Hotkey to
Set SOURCE=right (or Set SOURCE=toggle if you want it to toggle between the two).

(In the command, "right" maps to the bottom half when using a dual-horizontal layout. The commands generally always use "left" and "right" but work with both layouts.)

I'm impressed how fast you have responded: Thank you so much Leo

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