In Calendar Settings, you can customize options like displaying weekends, showing task start and due times, setting default event duration and reminders, and choosing the first day of the week.
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Click on Settings on the top bar to navigate through.
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Select Calendar on the left hand side of the bar.

You can also define Business Hours for each day, which helps visually separate working hours from non-working hours in the calendar view.

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Additionally, Override auto clean settings allows to auto clean calendar activities based on months old.
