Here are two ways to open a list (Paul's reply gives you the two views you can use once it's open):
1. From Model Settings tab (looks like a gear), expand Lists and Roll-ups if it is not already expanded, then double-click the name of the list to open it.
2. From the Model Settings tab, expand Lists and Roll-ups if it is not already expanded, then single-click General Lists. All the availabe lists show up on a menu to the right. Single-click on the name of the list you want to open, then click the Open icon in the toolbar above the list names.