I read this post Unsolicited email incident on Groups.drupal.org and I want to remove this permission "Add user"(Users may add other users to the group without approval) and the link form the group tab "Add people"(Add group members).

I want my user who create a group to "Override default roles and permissions" and have all permissions without this one "Add user"

I found similar issues but not solution for this problem:
https://www.drupal.org/node/349046
https://www.drupal.org/node/245885
https://www.drupal.org/node/1230240
https://www.drupal.org/node/300133
https://www.drupal.org/node/2176679

Can you help me, please!