Desactivate Search by Author

You could either add something like this to your theme’s functions.php

function remove_SUL_search(){
	if( function_exists( 'Simple_User_Listing' ) ){
		remove_action( 'simple_user_listing_before_loop', array( 'Simple_User_Listing', 'add_search' ) );
	}
}
add_action( 'wp_head', 'remove_SUL_search' );

or you could copy the search-author.php template into a simple-user-listing folder in your theme (so simple-user-listing/searcch-author.php) and make it a blank file.

The first solution is cleaner I think, and it works well !

Thank you very much for your support !

Cheers ??

I agree the first solution is much cleaner. It just depends on how comfortable people are with code.