remove gutenbrger by template

functions.php

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

    $excluded_templates = array(
        'front-page.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 );