Music Playlist is blank

Songs are not shown - screen is blank - if I view the playlist as "View as Songs"

I have an I Mac bought new a year ago.

I switched and downloaded from OS Catalina to OS Big Sur today.

I have Music version 1.1.2.28.

I can't remember which Music version I had yesterday.

Now songs no longer show on my playlists, if I click on View as Songs.

Songs do show if I click on View As Playlist.

However, I prefer it on View as Songs, I like the layout better than on View as Playlist.

Why is it blank if I click on View as Songs? It shows no songs, but does play them.

So the songs are there - just not shown. Same problem on all Music playlists now.

How can I make the songs visible with "View as songs"?

Note - there is a scroll bar on the right with View as Playlist,

but there is not a scroll bar on the right with View as Songs.

I suspect this has something to do with it.

I did not have this problem with OS Catalina.