Go to Manage Authors and click
Recalculate all author sort values
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Reset all the author sort values to a value automatically generated from the author. Exactly how this value is automatically generated can be controlled via Preferences->Advanced->Tweaks->Author sort name algorithm
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Manage Authors can be accessed via the context menu when you right click an Author name in Tag Browser or Book Details, or via the Alter Tag Browser button at bottom of Tag Browser
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