To hide items from the mobile site, first click on the gear icon and then click on mobile studio. Next, hover over an item and click on the pencil. Then, click on the eye icon to hide the item. Click on the eye icon again to show the item.
Exai allows you to create a mobile version of your website via Mobile studio. To learn more about mobile studio click here.
Now, some of the items present on your full size (desktop version) website may not be desirable to have on the mobile version because they may not be relevant for smaller screen size.