rtl.php

/**
 * Enqueue RTL CSS stylesheet
 */
function enqueue_rtl_styles() {
	// Dequeue main CSS file
	wp_dequeue_style( 'theme-style' ); // replace "theme" by your the theme slug
	wp_deregister_style( 'theme-style' ); // replace "theme" by your the theme slug

	// Enqueue auto-generated rtl CSS file
	wp_enqueue_style( 'rtl', get_template_directory_uri() . '/rtl.css' );
}
add_action( 'enqueue_rtl_styles', 'theme_enqueue_styles', 999 ); // replace "theme" by your the theme slug