Uninstall a Workflow
You must be signed in to Automation as an administrator to uninstall a workflow that you've previously installed from Exchange, which will remove it from your tenant.
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Navigate to the Automation > Exchange page and select either the Explore or Installed tab.
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Find the workflow you want to remove, and click Uninstall under Actions.
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Cancel or confirm the removal of the installed workflow. Any sub-workflows would also be removed, unless they're being used by other workflows.