How to allow some specific users to login to Gitlab

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Hi, I have integrated my Gitlab server to my LDAP active directory. I have a user group for Jira which i used here as well in the Gitlab configuration.
Now i don’t want everyone who can login to Jira to login to the Gitlab account as well. I only want to allow some specific users.
Is there a settings in Gitlab configuration to achieve this thing?

Let me know if anyone can help on this. It will be hugely appreciated.