Collections
The Collection sidebar serves as a way for you to organize Projects into groups. You can create a Collection pressing the + button in the top right corner of the sidebar. You can then rename the Collection after creation. To change the name again just right click the collection and press Rename.
In order to add Projects to a Collection you can just drag and drop the Project's Table Row.
A Project can only exist in one Collection at a time. Meaning if you move a Project that exists in one Collection to a new Collection, it will be removed from the old Collection.
You can also have multiple levels of collections by dragging one collection into the other.
Once you've added Projects to a Collection, you can click on the Collection and the Table will only show the Projects within that Collection.