Maybe I misunderstand what you mean, but on the left of each track in a playlist there is a little 2x3 grid of dots. Drag it to move the track. This applies only to Roon playlists, not to Qobuz/Tidal playlists that you view within Roon. To do it in a Q/T playlist, you first need a local copy in Roon (open the 3-dot menu of the playlist). For Q/T playlists, you need to do it in the Q/T app