Deleting wikis
If you are the owner of a wiki site, you have Manager access and can delete any wiki or wiki pages on that site.
You can delete a wiki and all its pages by deleting the wiki from a project.
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Create a project or access an existing project, and open the project in edit mode.
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Open the page that contains the wiki.
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From the site toolbar, click More > Delete Page.
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Click OK.
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Publish the project.