A new configuration option has been uploaded to the platform today: being able to hide the "Last Name" field of the registration form. In this way, the user to participate will only be requested to enter his "First Name" in the registration form, along with the other information you need to collect.
To do this, check the "Don't require Last name" box, which is located in the Editor > Pages > Login and registration > Others section:
Note: This option is only available for promotions that work with the Login system. It is not available for Classic promotions.