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Hello.
1) Inside of the widget of Booking Calendar you can define how many years to scroll in calendar at the Booking > Settings General page in “Calendar” section.
2) Unfortunately inside of the widget does not possible to define the start month of calendar.
it’s possible to define start month / year of calendar inside of the Booking Calendar shortcode, during inserting this shortcode into the post or page. Please check more here https://wpbookingcalendar.com/faq/shortcode-booking-form/
3) The ability to define specific days as unavailable (this year), even if user scroll back in calendar, possible in the Booking Calendar Business Medium or higher versions.
Check more about this feature here: Watch it in this video guide
Kind Regards.