If/when you upgrade to version 20+, there is a pop-out navigator in the TAB bar.
This automatically hides itself when you carry on working.
No need then for the full navigator (in most cases or until you want to publish).
In older versions (i.e. 18) there is a 'pin' if you right click on the top of the Navigator.
When active the navigator will close itself when you carry on working.
You have to un-dock the navigator though - if it is docked then it will not auto-hide.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11