Runner and fork configuration

Hi all,

I made some research but I didn't find solution to my, apparently, easy problem. I have some difficulties to understand how runner and fork configuration work together.

In my case, as an admin, I create a specific runner for my project A. I'd like to all my "developers" could use this specific runner in their fork. They just don't have visibility on it. No available runners in their fork configuration. And I don't want to have a shared runner.

This is my runner configuration

Property Name	Value
Active	Yes
Protected	No
Can run untagged jobs	Yes
Locked to this project	No
Tags	docker internal maven
Name	gitlab-runner
Version	10.7.1

Could you explain me why ?

Thank you :)