Once opening the 'Screens' menu from the left you will be able to see a search bar that will allow you to easily find a screen within the list. Depending on if you have a basic or advanced license, you'll see one or two tabs at the top. A Basic license will only see the 'Individual' tab whereas the Advanced license users will see the 'Grouped' tab. 

Clicking on a screen will bring up a menu that will allow you to rename the screen by pressing on the pencil icon.