Tips on Customizing jwp-a11y

How to Hide jwp-a11y Admin Menus

function plt_hide_jwp_a11y_menus() {
	//Hide "A11y Center".
	remove_menu_page('jwp-a11y');
	//Hide "A11y Center → A11y Center".
	remove_submenu_page('jwp-a11y', 'jwp-a11y');
	//Hide "A11y Center → jwp-a11y Setting".
	remove_submenu_page('jwp-a11y', 'jwp-a11y/jwp_a11y_setting');
	//Hide "A11y Center → ICL".
	remove_submenu_page('jwp-a11y', 'jwp-a11y/jwp_a11y_icl');
	//Hide "A11y Center → Page".
	remove_submenu_page('jwp-a11y', 'jwp-a11y/jwp_a11y_page');
	//Hide "A11y Center → Checklist".
	remove_submenu_page('jwp-a11y', 'jwp-a11y/jwp_a11y_checklist');
	//Hide "A11y Center → Bulk".
	remove_submenu_page('jwp-a11y', 'jwp-a11y/jwp_a11y_bulk');
	//Hide "A11y Center → Issue".
	remove_submenu_page('jwp-a11y', 'jwp-a11y/jwp_a11y_issue');
	//Hide "A11y Center → Document".
	remove_submenu_page('jwp-a11y', 'jwp-a11y/jwp_a11y_doc');
	//Hide "A11y Center → Download Issue".
	remove_submenu_page('jwp-a11y', 'jwp-a11y/jwp_a11y_download');
	//Hide "A11y Center → Show Result".
	remove_submenu_page('jwp-a11y', 'jwp-a11y/jwp_a11y_result');
	//Hide "A11y Center → Show Images".
	remove_submenu_page('jwp-a11y', 'jwp-a11y/jwp_a11y_image');
	//Hide "A11y Center → Show Live".
	remove_submenu_page('jwp-a11y', 'jwp-a11y/jwp_a11y_live');
}

add_action('admin_menu', 'plt_hide_jwp_a11y_menus', 11);

Where do I put this code?

How to Hide jwp-a11y Meta Boxes

function plt_hide_jwp_a11y_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "Additional Accessibility Check" meta box.
	remove_meta_box('jwp_a11y_add_custom_box_field_post', $screen->id, 'side');
	//Hide the "Additional Accessibility Check" meta box.
	remove_meta_box('jwp_a11y_add_custom_box_field_page', $screen->id, 'side');
	//Hide the "Additional Accessibility Check" meta box.
	remove_meta_box('jwp_a11y_add_custom_box_field_attachment', $screen->id, 'side');
}

add_action('add_meta_boxes', 'plt_hide_jwp_a11y_metaboxes', 20);