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Unfortunately, you can't delete images on the new image wizard.
However, you can still access the old image wizard by appending &old parameter in the URL while on the form builder.
Then follow these steps to delete the images.
1. Add the image field to your form
2. On the Image Wizard, select Choose From Existing Images then hit Next
3. Select an image and click the delete button to delete it.
If you need further assistance, let us know.