How can we select another group of users to join a project when the project is just allowing admins?

[Deleted user]

We currently have a project opened, but when the project admins are trying to add a specific group (example: jira-software-users - also, maybe for organization it'd be smarter to create a group called "Developers"..) we have created, the dropdown for when we click to add new groups is only displaying Administrators. 

How can we expose and bring to surface in this dropdown at the project level the other groups we have created in settings? 

Is this possible? If so, would love to know how to accomplish it. 

Thank you!

[Nic Brough -Adaptavist-]

Project admins can only add groups of which they are a member in a lot of places.

[Deleted user]

Thank you Nic! Very helpful.