As an organization owner or project board admin, you can remove an outside collaborator's access to a project board.

  1. In the top right corner of GitHub, click your profile photo, then click Your profile. Profile photo

  2. On the left side of your profile page, under "Organizations", click the icon for your organization. organization icons

  3. Under your organization name, click Projects. Projects tab for your organization

  4. In the projects list, click the name of the project board. Select project

  5. On the top-right side of the project board, click Menu.

  6. Click , then click Settings. Settings option in drop-down menu from project board sidebar

  7. In the left sidebar, click Collaborators. Collaborators menu option in left sidebar

  8. Next to the collaborator you want to remove, click X. "X" removal icon next to collaborator's username