A song can be assigned a follower. This creates a chain. Shuffle keeps chained songs together.
Followers are designated from other songs in the playlist. To create a follower, click a song’s add follower button.
The Song Finder can find chains.
Add follower buttons appear only on larger screens. They might not show up on your phone.
Chains are saved by playlist, browser, and device. So if you create some on your tablet, do not expect them to show up on your computer. But if you create some on your computer too, that is not a problem. They do not conflict.