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Hi @alexis822
The code at https://docs.pluginize.com/article/post-types-in-category-tag-archives/ should be a great starting point, even if it’s more around categories and tags. You could still use it, with minor changes.
For example, anywhere that says is_category() || is_tag() could instead be reduced down to just is_author()
The snippets would go into your active theme’s functions.php file or they could be turned into a quick plugin. Alternatively, if there’s a custom code spot in your theme where they allow for pasting snippets, it could likely go there as well.