To unlink a GitHub commit from a Xebrio task, go to the details window of the specific Xebrio task. Navigate to the GitHub tab, and then to the Commits secondary tab. For the GitHub commit to be removed, click on it's three dot vertical menu and select the Unlink Commit option.
Users will need view and edit permissions in the tasks module to perform this action. Depending on the user's project permission settings, they may be able to view all project tasks or just a subset. Watchers specifically added to the task will be able to view it.