public function register( $option_group ) {

		// Register rendering callbacks only for non-grouped controls.
		if ( empty( $this->grouped_with ) ) {
			\add_settings_field( $this->get_id(), $this->short, [ $this, 'render' ], $option_group . $this->tab_id, $this->section, $this->settings_args );
		}
	}