Hello,
I would like to see a way to hide/un-hide track library toolbar without having to deselect the library.
A button could be placed on the 'Standard' toolbar. Something like a small up/down triangle to hide/un-hide the toolbar. The triangle could be red to collapse the track library toolbar:

and green to restore it.

If no track library has been selected, the arrow could be grayed out and/or disabled.

Just a thought.
ED