Turn on the calendar strategy by going to ☰ → Features/Strategies to get a calendar view inside Marvin.

Once you enable the strategy, you'll be asked how you want to access it within Marvin:

To go to the calendar overlay, tap "C on your keyboard from the day/main view or click the calendar button in the sidebar/skinny sidebar/bottom menu:

Here is what the Marvin calendar overlay looks like:

The current day is highlighted and there is a colored line that marks the current time of the day.

On the top left you can switch between viewing a day, 5 days, a week or a full month. 

In the calendar (day, 5-day, 7-day view) you can see tasks that are 

The length of the task is defined by its duration estimate.

You can also see the following:

The month view differs from the rest since it also shows items based on their due date (deadline) instead of when they are scheduled. 

You can control what is displayed using the "Controls Sidebar". To open it, press "C" on your keyboard, or click on this button in the top-right corner:

You can either drag existing tasks into the calendar or create new ones by clicking anywhere in the calendar. 

To drag a task into the calendar, click the Master List button at the top right to open your schedule sidebar:

Then simply drag a task from the sidebar into the calendar.

To create a new task right in the calendar, click anywhere in the calendar to create a new task. 

You can move the task and change its size afterwards.
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If you only want to see certain items in your calendar at a time, click the controls button at the top right (cog) and use the filter in the sidebar:
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In the controls sidebar you can also change the slot size so tasks snap to the grid every 5min up to every 30min. 

Changing the height property zooms in and out of the calendar. You can also use the number keys "1" and "2" on your keyboard to zoom in and out. 

The calendar is also used for the time blocking strategy. Read more about time blocking in this article:
​https://help.amazingmarvin.com/strategies/planning/time-blocking

To remove time from a task, shift-click it in order to be able to edit it, and then click on the "X" icon to remove the time.