I used to be able to download all of the songs in a playlist from iCloud at once in Music, but the download button is no longer showing in the playlist title area it used to. It does show next to individual songs that haven't been downloaded, however selecting all and right-clicking now longer shows a download button in the context menu either. The only way I have found to download more than one is to go to the album, and the download button shows in the album title area.
Any ideas on how to re-enable the download button? Is this a bug?
Note: it does not seem to make a difference if the playlist only contains content I have purchased, uploaded with iTunes Match, or added to my library from Apple Music.
Album view with download button visible:
Playlist view missing the download button: 
Download button missing from menu: 
Best Answer
In playlists you can click on the three dots at top right and select "Download" from there.