The Practice controls allow automatic tempo increase and/or transposition at each repeat.
 
iOS, Android: Tap on the chart, then tap the ‘practice’ button (graduation hat) in the player controls.
Mac, Windows the Practice control sliders are near the bottom of the Player controls when on the right side.
(They are not shown when Player controls are at the bottom.)
Mac: View > Maximise Player Controls
Windows: View > Toggle Player controls
 
Drag the slider to the left to turn it off completely.
When you select another song, Practice settings will turn off automatically.
 
iOS shown