P: LIbrary Filter Drop-down sub-menu

Would like to see Sub-menu like the Develop. This will shorten the root menu.
Possible examples of submenu grouping highlite in colors.
Personally I seldom use camera settings in my filter presets nor Creator, copyright and job.

Attached is the present where there's only sub-menu for Develop (which is good). Hopefully the development team will add one or two groupings .. or even have a Windows like Explorer Quick Access group users could add to for frequently used selection.