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