About management of the default branch name
When a member of your organization creates a new repository in your organization, the repository contains one branch, which is the default branch. You can change the name that GitHub Enterprise Server uses for the default branch in new repositories that members of your organization create. For more information about the default branch, see "About branches."
既存のリポジトリのデフォルトブランチを変更できます。 詳しい情� �については「デフォルトブランチの変更」を参照してく� さい。
If an enterprise owner has enforced a policy for the default branch name for your enterprise, you cannot set a default branch name for your organization. Instead, you can change the default branch for individual repositories. For more information, see "Enforcing repository management policies in your enterprise" and "Changing the default branch."
Setting the default branch name
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In the top right corner of GitHub Enterprise Server, click your profile photo, then click Your organizations.
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Organizationの隣のSettings（設定）をクリックしてく� さい。
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左のサイドバーでRepository defaults（リポジトリのデフォルト）をクリックしてく� さい。
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Under "Repository default branch", click Change default branch name now.
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Type the default name that you would like to use for new branches.
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Click Update.
