calendars accidentally hidden

[diemelone]

**Is your feature request related to a problem? Please describe.** Users often hide calendars accidentally when in backend **Describe the solution you'd like** make the hitbox smaller for disabling a calendar eg only the colored circle or a checkbox, and add a well visible feature to distinguish if a calendar is hidden or not. The white circle doesn't really fulfill that. Maybe coloring the "app-navigation-entry__title" in the chosen color when active and making setting the opacity appropriate when deactivated while a checkbox in front indicates the visibility I don't really care how this is solved just something that makes it quite obvious which calendar is hidden. **Describe alternatives you've considered** none **Additional context** none

[st3iny]

Now, that we have checkboxes instead of dots this makes more sense in my opinion. Disabling a calendar will make it disappear because it is moved under the Hidden section.

We should check for clicks on the checkbox only.