Multiple calendars in one button of the quick filters

[shoneg]

Checklist

• [x] I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• [x] I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• [x] I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• [x] I have taken the time to fill in all the required details. I understand that the request will be dismissed otherwise.
• [x] This issue contains only one feature request.
• [x] I have read and understood the contribution guidelines.

Feature description

Currently, you can select to which calendars should be filterable by the quick menu at the bottom of the calendar view. I would like to have a feature to hide/show multiple calendars with one button in this menu.

Why do you want this feature?

I'm using several calenders, hosted in a Nextcloud. I use the different calendars for different contexts. E.g. one for universitity, one for my hobby, one for my private stuff and so on. I'm sharing each of these calendars with different people. But with some people I'm sharing multiple of the calendars. For example my housemate can see nearly all the calendars. When he now wants to toggle the visibility of my calendar events, he has to tap multiple buttons each time. When the feature would exisists, he could bundle all my calendars in one button.

Additional information

No response