additional context "folders"

[crpb]

Hi,

it came to my attention that if you have "Show All" enabled and then switch to "Calendars" you can't select/configure multiple Calendars for side-by-side or overlapping(or however this is called) view as the checkboxes aren't available. Previously confiured calendar views work tho. So maybe it would be better to have an additional context named "Folders" like in a certain Software.

Or at least add the capability for those checkboxes. Maybe like the "Favourites" drop/down div?