Easy way to enable right sidebar in all wordpress post for astra theme add following code in your current themes function.php file.

‘post’,
‘orderby’ => ‘ID’,
‘post_status’ => ‘publish’,
‘order’ => ‘DESC’,
‘posts_per_page’ => -1
);
$result = new WP_Query( $args );
if ( $result-> have_posts() ) : ?>
have_posts() ) : $result->the_post();
update_post_meta( get_the_ID(), ‘site-sidebar-layout’, ‘right-sidebar’ );
endwhile;
endif;
wp_reset_postdata();
}

?>