In fullscreen mode, you have at the top of the screen; a Thumbnail Filmstrip.
And on the right-side; a panel with File Properties, Metadata and Histogram.
Both of these are auto-hiding (with a stickpin to keep them displayed).
Love it!!!
Could you do the same with the Toolbar?
Memo: As it would be awkward to have two floating views on the same side; either the Thumbnail-strip or the Toolbar would need to be moved to the bottom of screen.
Feate Request - in fullscreen; make TOOLBAR (what you called) a floating view
Moderators: XnTriq, helmut, xnview