When working in live service, you can use the check-in panel to manually mark when bookings have arrived, ordered, paid etc and eventually Left - see this guide with more information on booking stages - once a booking is marked as Left this is then moved out of the Bookings list and into Finished Bookings list.
To make sure that all bookings are marked as Left when their booking has finished, you can enable Collins to do this automatically - follow the steps below to enable this feature on your diary/floor plan/runsheet:
Go to Settings
Venues > Select your Venue
Diary settings tab on the left-hand side
See ‘Booking Stage Automation’ section
Tick the box ‘Enable’ next to Automated left stage
Make sure to SAVE the settings page
Once this is enabled, Collins will automatically check your bookings out once their booking time has lapsed. You will still be able to check bookings out early manually or adjust their duration should any bookings run over time.