You may want to specify a minimum or maximum number of tickets per order, for example, if you offer a group discount for purchases of over 10 or more tickets, or if you're taking registrations for a sports team of a certain size.
How to set a minimum or maximum number of tickets per order
Navigate to the edit event form or create a new event.
Create all of the ticket types you want to sell.
Set the quantity to the maximum available.
Click on 'Add a new ticket group'.
Give your group a name that represents your tickets.
Under 'Add tickets', tick the box for each ticket that should be restricted by the order limit.
Click 'Save ticket group', and your checkout will look something like this.