Notes:
- Projects (beta), the all-new projects experience, is now available. For more information about Projects (beta), see "About Projects (beta)."
- You can only create a new project (classic) for an organization, repository, or user that already has at least one project (classic). If you're unable to create a project (classic), create a project instead.
By default, organization members have write access to their organization's projects (classic) unless organization owners or project (classic) admins set different permissions for specific projects (classic).
Setting a baseline permission level for all organization members
Tip: You can give an organization member higher permissions to project (classic). For more information, see "Project (classic) permissions for an organization."
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In the upper-right corner of GitHub Enterprise Server, select your profile photo, then click Your organizations.  
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Click the name of your organization. 
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Under your organization name, click Projects.  
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Click Projects (classic) 
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In the projects list, click the name of the project (classic). 
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On the top-right side of the project (classic), click Menu. 
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Click , then click Settings.  
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Under "Organization member permission", choose a baseline permission level for all organization members: Read, Write, Admin, or None. 
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Click Save.