On the windows version, pressing control+tab cycles focus through the series; binder > left editor > right editor.
It does this even when the binder is not displayed. So if you’re working with the outliner in the left pane and text editor in right pane, switching from the latter to the former requires 2 control-tabs, one of them focusing on an invisible screen element.
I’d prefer it if the binder was excluded from this cycle when it is hidden.
Cheers,
David