Change the band octave of the loop on a mobile phone?

Yesterday, I wasted some time in GarageBand and created a song. Then I wanted to edit the pre-made loop and make it deeper. While clicking around on the left side, I somehow opened something where you could change the octave. Shortly afterward, I couldn't remember how I did it, and now it's racking my brain. Does anyone know how to do this? It's on my phone. The picture shows the area where I found the "Change Octave" option.