Rocket Visual Editor comes with an exclusive toolset, that lets you create a truly responsive website in a whole new and visual way. You can easily customize your content specifically for mobile devices : change the responsive breakpoint, adapt font-size, spacing, alignment, column layouts, in real-time preview.
This is also a wonderful and powerful mobile site builder for creating perfect responsive websites.
Let click the Responsive mode at the left sidebar.
You can adjust the width of the screen on the Ruler
After changing to the responsive mode, please select elements to style as same as you do on the Desktop view.
Don't forget to save the changes as well!