Using V3's beta.

It's the sub-palette that carries more tools. Life for "Boolean" you get the layout that has the icons for "Diff", "Union", "Isect", & "Merge"

Even when not it use and last open. They close up too (along with the whole UI) when the FullScreen.js is activated. Except during the first event upon after program start, only the sub -palette closes.
FS has to be activated again.