最好的方法是使用pre_get_posts 过滤器，用于更改主查询。这样，您就不会运行默认查询，也不会在其上运行自定义查询。您必须确定“如果”条件，以便仅对要影响的查询运行：

<?php
function wpse_366882_get_all_posts($query) {
    // This will run for all main queries that are not in wp-admin.
    // You may want "is_archive()", "is_page(\'slug\')" or some other condition.
    if ( ! is_admin() && $query->is_main_query() ) {
    // Setting to -1 shows all.
        $query->set( \'posts_per_page\', -1 );
    }
}
add_action( \'pre_get_posts\', \'wpse_366882_get_all_posts\' );
?>