Locate the text for your R-group label in your specification.
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Select the label text.
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Select the Delete R-Group option from the Terms menu
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OR
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Right-click the selected text and select Delete R-group from the context menu provided.
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Open the R-groups Manager.
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Locate the entry for the desired R-group in the left-hand sidebar list.
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Hover over the R-group entry and click the trashbin icon that appears on hover.
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Confirm your deletion in the dialog presented.
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Text previously tagged as R-group data will be highlighted in your application to facilitate making the appropriate updates as you desire.
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See this article for steps to delete all R-groups at once.