Hello @creeksidecomm ,
If you've used the section editor (that pencil in the top-left corner) to edit your email's margins, background, or borders, then it will override the Design tab's background options. Once used, only the section editor will be able to be used for outer background formatting. For more info, please see our main article on the section editor's functionalities.
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Hello @creeksidecomm ,
This is a known issue for the dev, so I've tracked the issue to your account. If and when there's an update, they'll notify you directly. In the meantime, there isn't really a workaround or prevention for this if you're editing a Read More block in your email campaigns.
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