Thank you for reaching out to The Community! I’m afraid the Resize option you find in our built in image editor will only crop the image and not affect the dimensions. Many of your images, although resized in your template to be smaller, were originally uploaded at 800 pixels wide. Large images that are resized to be smaller in desktop will show as full width on the mobile version because our templates are mobile responsive. For images that are displaying large in the mobile view, this change would need to be resized outside of Constant Contact in a program that can edit your images.
Antonas_S Community & Social Media Support
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