Configuring number of tickets in Shopping Cart mode

When using the shopping cart mode for events, where can I configure the max number of tickets that can be registered to a single event?.
I wish to allow someone to buy a ticket for their partner, without requiring separate registration (or allowing group registrations).
The 'quantity' option to select more than one ticket is visible, but not changeable, causing confusion.
Also if only one ticket is available per registrant, why would the quantity option show?
Thanks

Hello

It causes by Prevent Duplicate Registration config option. If you do not need that, go to Events Booking -> Configuration, set Prevent Duplicate Registration config option to No

Regards,

Tuan

Thank you Tuan, that solves my immediate issue.
I have two improvement suggestions relating to this area that you may want to consider:
1. If the Prevent Duplicate Registration setting is set to YES, it would be good if the quantity setting was not visible (as it makes no sense and it appears that multiple tickets can be purchased, yet it doesn't work),
2. If the Prevent Duplicate Registration is set to NO, it would be great of we could nominate a maximum number of extra registrations allowed (for example max 2 if partners are invited).
Thanks again