Navigate to a product page with the ‘Annotate new product’ button.
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You can delete the annotations on your images by clicking on the delete button on the right hand side associated with annotation name.

You can also delete annotations by clicking the red ‘Delete’ button in the Measurements section below each annotation name.
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NOTE: When you delete an annotation from the Measurements section, you delete both the measurement and any line associated with it on your product images.