Remember which calendars are selected when we leave that pane
In Outlook 365 for Mac, I have multiple calendars in my account, only one which I use regularly. Whenever I click on the "Calendar" icon, every calendar in my account is selected. I have to manually deselect the lesser used calendars every time.
When I uncheck a calendar, I want that calendar to stay unchecked until it is selected again. I do not want the calendar deleted, or removed from the list, I just want it to stay unchecked.