Article: This appears when a song is currently being played. Tapping the mini player will expand the Now Playing screen. This will list all of the songs that are coming up next in the queue. You'll find this button to the right of the "Up Next" section. The button is just the Shuffle symbol.

What is a summary?
Open the Music app and tap the mini player at the bottom. Swipe up on the screen to find the "Up Next" section. Tap the "Shuffle" button to turn shuffle off.