If you would like to hide something from showing up on your live site in a particular mode (Mobile or Desktop), you can use our hiding functionality for this.
Simply select the object in the mode you would like to hide it in (or both modes if you don't want it to appear at all) and go into the arrange tab.
In there, you will have the option to set it to hide, which will bring its opacity down within the editor so you know it's hidden.
Save the page and view it live from that mode and you'll notice it won't appear.
This will also prevent that object from loading on page load so it won't slow down your site.