Unable to add paypal registration to webinars

I have been conducting paid webinar classes since 2021, and took a break at the end of the summer. Now that I'm going to start up again, I've noticed the option under registration no longer exists. The only option I have is a check box to confirm if registration is required or not. I've checked my account settings and my Paypal account is still connected. 

Does anyone know how I can fix this?

Thanks.