WordPress Guteberg for RTL swticher

functions.php

<?php

// When you like your admin in LTR but you have to edit a gutenberg page that is in hebrew or arabic that is RTL,
// and to avoid switching the user language, just paste this code on your functions.php and on the url of the edit page add 
// the query param: dir=rtl and from there on the gutenberg editor area will keep RTL

// if you wish to all content to display in certain direction

define( 'VISUAL_EDITOR_DEFAULT_DIRECTION', 'rtl' );

// Set RTL to post for Gutenberg Editor to keep RTL

add_action( 'admin_print_styles', function() {
	$dir = sanitize_text_field( $_GET[ 'dir' ] );
	$post_id = sanitize_text_field( $_REQUEST[ 'post' ] );
	if ( is_admin() && current_user_can( 'edit_post' ) && $dir ) {
		update_post_meta( $post_id, 'direction', $dir );
	}
	$dir = get_post_meta( $post_id, 'direction', true ) ? : ( defined( 'VISUAL_EDITOR_DEFAULT_DIRECTION' ) ? VISUAL_EDITOR_DEFAULT_DIRECTION : null );
	if ( !$dir ) return;
	?><style id="visual-editor-lang-direction">
	.edit-post-visual-editor {
		direction: <?php echo $dir ?>;
	}
	</style><?php
} );