Deleting forks of private repositories
While forks of private repositories are deleted when a collaborator is removed, the person will still retain any local clones of your repository.
Removing collaborator permissions from a person contributing to a repository
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在 GitHub 上，导航到存储库的主页面。
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在存储库名称下，单击 “设置”。 如果看不到“设置”选项卡，请选择“”下拉菜单，然后单击“设置”。
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在侧边栏的“访问”部分，单击“ 协作者和团队”。
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To the right of the collaborator you want to remove, click Remove.
