Hello.
Such functionality, ability to select only week(s) available in the Booking Calendar Business Small and higher versions.
Please check more about days selections here: https://wpbookingcalendar.com/overview/#range-days-selection
For setting ability to select only weeks, you need to make this configuration:
Open the General Booking Settings page and in “Calendar” section activate the “range days selection mode using 2 mouse clicks”
then set
– minimum number of days selection as 7 days
– maximum number of days selection as 28 days
– and specific number of days selections as 7,14,21,28
Save the changes and test it.
Kind Regards.