You can access the Manage Content options via the icon in the top right area.

Manage Content

 

You will be presented with the following options

Add a single game

You can add one game from this option.

 

Add folder for one system

If you have a bunch of games for one system, you can add them in one go.

 

Force rescan

You can rescan all or individual systems from this option

 

Manage folders

You can manage local or network storage from this option.

 

Uninstall games

From this option you can delete individual or all the games in your game library. You can find a more detailed guide on how to uninstall games here.

 

Help

You can find in-app help from this option.