Visit: https://sweepsouth.com/admin/bookings then select 'Completed' from the options in the top right! Via the app - click on the menu (3 horizontal lines) and select 'Bookings' and select 'History'.
Recurring Bookings via web
For recurring bookings, you will only be able to see the booking reference number from the first booking within the set, all you need to do is click on the little blue arrow on the left of the booking reference number and you will be able to see all of the bookings within the recurring set.