As shown below:
If one day has activity, color will appear on the calendar to remind.
4.11.1 Add An Account
While using the calendar at the first time, it will remind you to add an account.
Click "Add account" to add an account, and then synchronize all the schedules of the
account to the calendar.
4.11.2 View Calendar
The calendar will display monthly by default, and you can slide the calendar up and
down to view the different months. In order to view the activities or create the new
activities, you can also make the calendar display daily or weekly. While using daily or
weekly displaying, you can slide the calendar left and right to view the different day
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