You can change it in Calibre.
Go to "Preferences", then "Tweaks".
You will see a long list of customizable options, look for "Author Sort Name Algorithm"
The instructions are in the top box, as follows:
Quote:
The algorithm used to copy author to author_sort
Possible values are:
invert: use "fn ln" -> "ln, fn" (the default algorithm)
copy : copy author to author_sort without modification
comma : use 'copy' if there is a ',' in the name, otherwise use 'invert'
nocomma : "fn ln" -> "ln fn" (without the comma)
When this tweak is changed, the author_sort values stored with each author
must be recomputed by right-clicking on an author in the left-hand tags pane,
selecting 'manage authors', and pressing 'Recalculate all author sort values'.
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If ALL of your authors are listed by first name then you want to change your default to either
"Invert" or "
Comma" (my favorite).
I would suggest that you look around at all of the applicable tweak options, there are some really cool things in there.
Be sure to restart Calibre after changing any tweaks.