If you have Streams that aren’t part of a Stream Group, it will automatically appear as "ungrouped" this will happen when you have not specified what you want the stream group to be called.
Here’s how to change the name of the Group...
1) Select the stream and click on the drop down menu which is located on the top right hand side, you then need to Select edit stream from the drop down menu.
3) You will see a screen like this appear, and you can create a new Group Name, or double click to choose from existing Group Names. Click Save, and you’re done!