Hallo.
I wanted to change author/author sort and especially the appearance in the home-file. So far I was very successful (in changing), only the result is not just the one wanted. It's a total mess now.

How many times I have changed anything and what, to ask would be quite pointless.
Before (sorted alphabetical→s. a.)
Authors
fn ln, s. a.
fn (tag browser)
Authors sort
ln, fn
home-file
fn ln, s. a.
fn
Wanted
Authors
fn ln, s. a.
ln (tag browser)
home-file
fn ln, s. a.
ln
Consequently, it is probably just best to show you the status quo and to solicit general advice.
Manage Authors
Preferences→Advanced→Tweaks→Author sort name algorithm is set on
author_sort_copy_method = 'comma' (default)
I suspect any solution means some manual work, but that does not matter, makes me more and more familiar with my library and calibre.
Calibre main view
Carlo Fruttero & Franco Lucentini and
Falk Lüke are authors of multi authors books. Why these 3 books (from that authors couple) are on top, that one from
Falk Lüke not in line, I don't know!?
Multi author book
In the example the 4 authors
F Brænne, Kari +
F. Galouye, Daniel +
F. Gifune, Greg +
F. Pötzl, Norbert are to change manually, I gess. Calibre doesn't treat 3 or 4 name authors like (normal) 2 name authors. Anyway, that isn't a (big) problem, they are in minority.
I can do that on two ways, with tool
Edit metadata individually or
Rename [author name].
Results in tag browser OK, but not in home-file.
Authors
fn ln, s. a.
ln (tag browser)
home-file
fn ln, s. a.
fn
Kari F Brænne - - - - - - - - -
Kari F Brænne_home-file
Daniel F Galouye - - - - - - -
Daniel F Galouye_home-file
The writing of
Fabio Genovesi and
Falko Rademacher is OK, but not the sorting. Of course I can do that as described above (
Edit metadata individually or
Rename [author's name] - but not for about 9000 books.
And in general (applies to all authors), how do I change the home-file sorting?