You can easily hide elements and sections from the desktop or mobile version of your website.
To hide an element, click on it, and then click on the eye icon:
You can do the same with all except the following sections:
Header
Footer
Online store (single product and product list sections)
Blog
Blog post header
Slideshow
Click on a section, and then click on the eye icon:
And that's it!
You may even duplicate an element or section, and have one version visible on desktop and another one visible on mobile: this way, you get more freedom when styling the content on desktop and mobile individually, as, normally, some settings (e.g., the same text alignment) apply to both desktop and mobile