Mobile styles on version 7.0 and responsive design are different, but related, concepts.
•Mobile Styles are unique to version 7.0 templates. These styles only affect mobile-specific navigation, restrictions placed on loading content backgrounds, and other design elements that might be unwieldy on mobile devices. These elements are disabled when you disable mobile styles to present a more computer-like version of your site.
•Responsive Design refers to the ability of your site and its content elements to adjust their size to fit the visitor's browser window. Responsive design remains in place for all Squarespace sites even with 7.0 mobile styles disabled. This means that the full website will still be sized to fit smaller devices, but if mobile styles are disabled, the content won't rearrange for easier navigation. Mobile styles can't be disabled on version 7.1, so content will always rearrange and resize. To learn more, visit Responsive design.