it mentioned:
1. Go to Event Booking -> Configuration, looks at Billing Fields and Group Member Fields tab and change the settings to meet your need.
1.3. Billing Fields settings
But I can not see Billing Fields and Group Member Fields tab, ?? if it is because I didn't enable some plugins??
I am sorry. The documentation is outdated. From version 1.6.4+ (the documentation was written for version 1.6.3), all fields are now managed in Events Booking -> Custom Fields section.
So if you want to show/hide any fields, please just go to Events Booking -> Custom Fields to Publish/Unpublish it and it will work well