How do I turn off shuffle when listening to a playlist

Hi there, marionfrompymble!
Thanks for reaching out to the Apple Support Communities! That is a great question you have about turning off the option to shuffle your music and I am happy to assist! Take a look at this article to Play, repeat, and shuffle music and check out these steps specifically:

Shuffle songs

Open the Now Playing screen and scroll down.

Tap to set Music to always shuffle a list of songs selected. Any album, playlist, or set of songs will play in a random order.

If shuffle is on, you'll see . To turn it off, tap the button until you see .

Cheers and happy listening!