Hey. First of all, you are welcome ^^
What do you mean with Toolbar navigation pane ?
If you mean the sidebar with the bookmarks or the right menu, then that does not work.
Look here: https://github.com/Robbendebiene/Gesturefy/issues/141

You can already use >Maximize window< (relatively far down in Gestures)
>Restore window< is also possible, If the last tab was a window.
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Edit: Oh sorry, misunderstood.
It is not possible to go back to previous size. Is only possible to go to the maximum window.
Look here for more informations: https://github.com/Robbendebiene/Gesturefy/issues/112