The purpose of responsive design is to have one site, but with different elements that respond differently when viewed on devices of different sizes.
Responsive Web Design is automatic resize, hide, shrink, or enlarge, a website, to make it look good on all devices (desktops, tablets, and phones).
Vintcer automatically resize your website as per device or screen size. You can preview how your website appears on Mobile and tablets directly from website builder.
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From top bar click on Preview button (Near Publish button )
Now, click on Mobile or Tablet option to see how it appears on respected device.