How to hide items in the Mobile Studio?

Step 1: Enter the mobile studio (Click on the mobile icon on the top dashboard menu) 
Step 2: Hover over the Item you would like to delete 
Step 3: Click the recycle bin icon (Green square on the right image) 

The item we deleted moved to the recycle bin (Left image) 

How to un-hide items in Mobile Studio:

Step 1: Enter the Mobile Studio
Step 2: Click the recycle bin tab (You will see all items you have deleted)
Step 3: Drag the item to the desired location in the Mobile version