The widgets available for the Dashboard are divided into different categories: charts, lists, calendars and utilities.
The third category is calendars.
For the calendar widgets, you'll see quite simple settings that are the same for both the month overview and the day calendar.
Click on your desired Calendar and personalize the name if you like it by clicking into the little text field at the top. Additionally, you can decide which projects should be included in this widget.
Here you can choose two approaches. Either you select "Exceptions" which should not be included in the widget or you select in the dropdown above which projects should be included. There is also the option "All" here.
Besides, it is also possible to filter the tasks even more precisely here. If you want to learn more about filters, click here.