Instead of filling the calendar with all dates, you may wish to configure it to allow to select only the dates that exist in the data.
For this, select Datasource Data :
The DatePicker has a single data field for binding : Using
Using : filter value and display
This represents the date field we want to use to present all the available distinct dates.
This field cannot be aggregated because it must have several separate values in order to be used as filter.
This is a required field.
The range of available dates will be the range between the oldest and the latest date in the date field.