Open Spotify
Start playing a song, album, or playlist
Tap or click the Shuffle icon
Turn Shuffle off so it is no longer highlighted
On mobile, the Shuffle button is usually at the bottom of the Now Playing screen
On desktop, the Shuffle button is usually near the playback controls
If Shuffle stays on, check whether you are using a playlist or album that has Shuffle enabled by default
If needed, restart the app and try again