In order to allow access, only to logged in users, to create groups
Step 1:
Login to your admin panel
Step 2:
Click on "Settings->General" from left menu.
As shown below as a screenshot
Step 3:
Search for "If yes, users can create groups:"
As shown below as a screenshot
Step 4:
Change settings as per your requirement and click on "Update".
Step 5:
Click on "Clear Cache" from the left menu.
As shown below as a screenshot
Step 6:
Clear your browser cache and check now.