As an Admissions Manager:
  1. Navigate to Enrollment Management.
  2. Select Admissions > Admissions Setup > Application Forms.
  3. Select Block Settings on your Household block.
  4. Toggle Yes/No for "Allow Add Another."
  5. Select Save.

User-added image

Note: Once an application is in use, fields - including Block Settings, will be locked down and unable to be changed. If you need to make changes to an application, you can Copy the application, make the necessary changes, and set this as your active application.