If you want to show certain elements on desktop and hide certain elements on mobile, you can use our show on mobile/desktop feature.
Show on mobile/desktop is only available on Block, Box, or Column elements which are structure elements and not on actual elements.
You can click on the structural element that you want to hide, and scroll down in the toolbox to Element Visibility.
When you switch off the show on mobile feature, you will see that the box is not visible on mobile preview.
You can see it on desktop preview only.
You can do the same with switching off Show on Desktop. In that case, you won't see this box on desktop but you will see it on mobile.
Let us know if you have more questions about this!