You want to have your attendees use a password to log in to your event with their email. If you created your event after July 5th (and it isn't cloned from an original event created prior), your password feature will be available. If you created an event on or after the 25th of August 2021, the password feature automatically be switched on.
If you'd like to check the status of the password feature on your event and edit it, can do just that with the steps below.
Head to Event Setup > Settings > Registration & Checkout Settings.
Scroll to Allow Attendee passwords under Attendee Experience and toggle this option.
When attendees sign up for the event and the password feature is switched on, they'll receive an email with their autogenerated password. If you're looking to change the email copy for the email attendees receiving their passwords head to Emails > Attendee emails.
Please note that you won't be able to edit what an attendee's random autogenerated password will be. You can use this help doc for some more details on email editing.
Attendees will still be able to use magic links to log in and reset their password if needed. Look to this help doc for more info on attendee login.