The Registration Intermediate Page is a page that appears immediately after someone submits the registration form, and before the confirmation page with the join link.
The intermediate page can be fully customized by uploading your own template file with any content you want. To not show any intermedtiate page simply don’t upload any template for the registration intermediate page.
Use the attached html file as a starting point
Note: make sure you always include a button or link to redirect to the registration confirmation details page.
Also see: Custom Registration Page Templates
Setting location: Conversation Settings > Registration Intermediate Page Template