disable-gutemberg

<?php 
/**
 * Templates and Page IDs without editor
 *
 */
function ea_disable_editor( $id = false ) {

	$excluded_templates = array(
		// 'templates/contact.php'
	);

	$excluded_ids = array(
		 get_option( 'page_on_front' )
	);

	if( empty( $id ) )
		return false;

	$id = intval( $id );
	$template = get_page_template_slug( $id );

	return in_array( $id, $excluded_ids ) || in_array( $template, $excluded_templates );
}

/**
 * Disable Gutenberg by template
 *
 */
function ea_disable_gutenberg( $can_edit, $post_type ) {

	if( ! ( is_admin() && !empty( $_GET['post'] ) ) )
		return $can_edit;

	if( ea_disable_editor( $_GET['post'] ) )
		$can_edit = false;

	return $can_edit;

}
add_filter( 'gutenberg_can_edit_post_type', 'ea_disable_gutenberg', 10, 2 );
add_filter( 'use_block_editor_for_post_type', 'ea_disable_gutenberg', 10, 2 );


////

/**
 * Disable Gutenberg only on homepage
 *
 */
function ea_disable_gutenberg($can_edit, $post_type)
{

	if (!(is_admin() && !empty($_GET['post'])))
		return $can_edit;


        $excluded_ids = array(
            get_option('page_on_front')
        );

        if( in_array($_GET['post'], $excluded_ids) ){
            $can_edit = false;
        }

	return $can_edit;
}
add_filter('use_block_editor_for_post', 'ea_disable_gutenberg', 10, 2);