Thanks for your interest.
Now a new sequence of screenshots that shows the issue.
1 - Start from album and click on "add library view"
2 - Select "Empty view " and click "Ok"
3 - On the "Customize view" screen...
4 - ...select "categories" and
5 - Add "Artist-Album-Year...
6 - here the screen
7 - And click on "Ok"
8 - this is the screen
9 - Now select "Details" from "List Style"
10 - and this is the view got still to customize
11 - take the first column off
12 - and continue the customization, like in the picture
13 - Going to the "album" view
14 - and going back on the customized view, nothing happens, the customized screen is still there, the problem is not here.
15 - Now double click on one of the row in order to see the details of the tracks
16 - and try to customize this view by track
17 - Now going to another view, "album" for example
18 - and going back on the "new library view" NOW the customization DISAPPEARS
The problem arises when you want to customize the detailed view by track.
I hope this helps
Regards