To add a calendar to the Calendars tab, Shift-drag it to the calendar. For example, to add a calendar called Our Group Calendar to the Calendars tab of your personal calendar, Shift-drag Our Group Calendar to your personal calendar.
To make all items from that calendar appear with the same background color when they are added to the combined view:
2 Choose Color, then the color you want.
To allow any color coding that was added to items in their own calendars to show through:
1 Open the calendar's context menu from the Calendars tab.
2 Choose Transparent.
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