So, why are there items for
Toolbars and
Keyboard Shortcuts on the All actions menu, rather than say items for
Look & feel and
Tweaks.
Ah-hah - I just discovered the items in the five Built in calibre actions flyout menus pop the relevant drop down menus. Seeing my shortcuts on those items misled me into thinking that selecting Preferences would pop the matrix of icons, but it pops the Preferences drop down. Likewise because Convert books shows Ctrl+Alt+C, I assumed it would pop the conversion dialogue, instead it pops the Convert books drop down (the one that includes Create catalogue).
Added:
Yet there's this:
I also suggest that "Main dialogue" should be "Change calibre behavior", as it is elsewhere.
BR