Hi @Ragusch1 and @Sicco0803 !
When a file is well hidden and hard to track down, you can always trust the filters inside the content browser. In your case specifically, click on the root folder called All and then add a level filter.
The result of adding this filter will show you all the levels in the selected folder. The one you would probably want is L_Expanse
If you double-click it and open it, it will probably seem like it is a blank map, so be sure to load all the cells in the World Partition panel to see the whole map (Window → World Partition → World Partition Editor)
If it’s the first project where you are using Unreal Engine, I would recommend checking the talk that was also released today called Your first game in Unreal Engine 5
It will let you know all about the features inside Unreal, and it will make you more comfortable with the editor
Happy game dev!
Ram