Project created by developer and he left the company, need to transfer project author to another. how we can shift the author while remove the user.
There is no concept of “author” in GitLab. You get permissions based on your role.
If the project was created in a group the membership is inherited by any project in the group. Simply adding someone to the group (permanent or temporary) where the project is placed will give access to the project.
If developer1 left the company everyone else in the group still have access to the project.
That’s author of the respective commit, not project. That cannot be changed.