Changing the source tab order.

iPad Mini 4 just purchased, replacing a mini 2, I can’t seem to find how to change the tab order on the bottom of the song selection window. Current order is
1: Playlists
2: Charts
3: Browse
4: Match
5: Queue

The mini 2 list order is
2: Queue
3: Match
4: Charts
5: Browse
And I remember clicking an additional window and dragging them into the order I want. Now I can’t find it.