It looks like you may have already managed to get this sorted, yes? (I’d just like to clarify before marking this as resolved 🙂 )
If not, we’d be happy to take a closer look. Kindly share a screenshot of the exact area of the Order Page that you would like to change.
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Can you please share a screenshot showing how you want to adjust it? This will help us understand and provide you with a more accurate solution.
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However, an easy hack will be to use the full width template for the My Account page. It will increase the full page width to 100%, including your order table.