How to keep pages/posts at full width display when working divi settings interface?

Juan Jose Lulli asked 4 months ago

Hi Mak, I really enjoy your divi tutorials. Thank you for taking the time to teach divi learners like me.
I have a small question.
On your tutorials, I notice that your pages/posts remain at full-width display with section/row/module settings interface locked on left side. On my mac laptop, site pages/posts compress, lose full-width display, header menu disappear or become hamburger menu. 
How can I click on divi settings interface and still maintain pages/posts at normal full-width display?