The Membership Sign-Up setting controls whether new people can freely join your community or not.
Disabling membership sign-ups is useful when you want to run a private community, limit access to invited members, or control enrollment for specific programs. This guide shows how to adjust the setting that controls community sign-up access.
Step 1: Click Admin Panel.

Step 2: Scroll down to Settings & Data, click it, then select Settings.

Step 3: You will land on the Community Details tab.

Step 4: Scroll down to the Community Sign-Up section. You have two options:
Open:
Anyone can create an account and join your community.
The Join Community / Sign Up button is visible on your community.

Closed
Only people you invite can join your community.
The Join Community / Sign Up button is hidden
Users can join only through an invite link sent by email or through an active, visible subscription plan link.

Step 5: Click Save Settings to apply the changes.
