If you exceed these limits by adding a booking manually, you will be warned in the following places:
In the Diary / Floor Plan / Run Sheet when adding a booking:
Within the expander panel on the Diary / Floor Plan / Run Sheet after the booking has been added:
Within the booking/enquiry:
The warning will include the max guests' amount of the limit, and how many guests are currently booked in, including the booking you are on.
If a rule has been exceeded, when using Find Areas you would be able to choose to 'Include exceed cover limits' to still allow Collins to suggest available tables.
Within the Enquiries page:
Within the Diary/Floorplan:
Once that option is selected, Collins will suggest all tables available with a warning that Cover Limits would be exceeded: