Advanced Calendar Sets

I really like the ability to have calendar sets with 0-9 keys but I think this could be reworked into a more advanced custom filters ability including tags (a little like todoist)

A filter could be as simple as a specific calendar to keep it as it is, but also incorporate tags (which seem quite useless as is).

These custom filters could then still use the 0-9 to not lose current functionality.

This would then even allow for less calendars to be used (so a filter to show ONLY appointments across all calendars) or a filter to show appointments across calendars tagged as travel.

I dont think it has to be advanced as todoists filters to begin with - but having the ability to incorporate tags into these filtered views will make Morgen far more useful I think.