Changing Site Membership Type
A site’s membership type determines how freely users may join your site. There are three types of site membership:
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Open: Users can join and leave whenever they want. The site is visible to all users in the My Sites app. 
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Restricted: The site appears in the My Sites application, but users must request membership to join. 
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Private: A site administrator must explicitly add users to the site. Private membership sites don’t appear in the My Sites app. 
Setting Site Membership Type
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Access the Membership Type option: - 
In Liferay DXP 7.4+ - 
From the Site Menu, go to Configuration → Site Settings. 
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In the Platform section, click Site Configuration and then click Details.  
 
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In previous Liferay DXP versions - 
From the Site Menu, go to Configuration and click the General section. 
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Find the Membership Type option under the Details area.  
 
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Open the Membership Type selector and choose an option. 
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Click Save.