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Click the ellipses (…) that appear when you hover on the end of the keyword row.
Select Delete from the menu that appears.
The keyword is deleted.
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Select Content.
Select Entity types.
Select the entity type that contains the keywords you want to remove.
Select Edit in the Keyword proximity section. The button becomes ellipses (…).
Select the ellipses.
Select Delete all keywords from the menu that displays.
Select Yes when prompted to confirm you want to delete all keywords.
