How do I arrange songs independently in my Apple Music playlists?

Trying to rearrange songs in a Music playlist, but it's not permitting me.

Strangely, I have other playlists where it is possible to drag and move songs independently, but other playlists Ive created that only allow the songs to be arranged by Title/Genre/Year etc, but I want a bespoke order.

Any idea why?

[Re-Titled by Moderator]