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I think I can help. You need to go to your post and select the primary term as your child category and then it will show you as you want

Hello,

Thanks for getting back to us.

We don’t have a filter that can change the primary category on all posts to be the child category selected.

A quick way to do this without needing to open the product page is with the quick edit options, this is way faster than opening the product page and you can do it directly from the products list page.

Once done please add this filter to the funtions.php file of your theme:

function wpse147453_remove_child_categories_from_permalinks( $category ) {
    while ( $category->parent ) {
        $category = get_term( $category->parent, 'category' );
    }

    return $category;
}

add_filter( 'post_link_category', 'wpse147453_remove_child_categories_from_permalinks' );

Hope this would be helpful. Do let us know if you have any other queries.
Thank you.

Hello,

This seems to have worked on my end as you can see in the screenshot here: https://i.rankmath.com/UPH4cu

We might need to take a closer look at the settings. Please edit the first post on this ticket and include your WordPress & FTP logins in the designated Sensitive Data section.

Please do take a complete backup of your website before sharing the information with us.

It is completely secure and only our support staff has access to that section. If you want, you can use the below plugin to generate a temporary login URL to your website and share that with us instead:

https://wordpress.org/plugins/temporary-login-without-password/

You can use the above plugin in conjunction with the WP Security Audit Log to monitor what changes our staff might make on your website (if any):

https://wordpress.org/plugins/wp-security-audit-log/

We really look forward to helping you.