That was exactly what I gave you the answer for four times - as early as post #10 in that thread. You have to edit your author sort field, if you are creating collections based on author sort.
So either:
- suck it up and live with multiple author based collections on your Kindle,
- suck it up and do this one-off exercise of editing author sorts for the subset of authors which do have multiple authors. It takes a second or two per book, it isn't that onerous. Even the largest book collections should be done in a couple of hours.
- post on meme's Kindle collections thread requesting a new feature to treat collaborative authors separately.
- don't create author based collections. You can create collections based on a custom column containing whatever you like. However that is still going to involve "effort" and even more complication which you seem to be wanting to avoid.
There is no magic solution.
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