code: function (enabled) {
      var sceneEl = this.el.sceneEl;
  
      function enableGrabCursor () { sceneEl.canvas.classList.add('a-grab-cursor'); }
      function disableGrabCursor () { sceneEl.canvas.classList.remove('a-grab-cursor'); }
  
      if (!sceneEl.canvas) {
        if (enabled) {
          sceneEl.addEventListener('render-target-loaded', enableGrabCursor);
        } else {
          sceneEl.addEventListener('render-target-loaded', disableGrabCursor);
        }
        return;
      }
  
      if (enabled) {
        enableGrabCursor();
        return;
      }
      disableGrabCursor();
    }
docs: Toggle the feature of showing/hiding the grab cursor.