Display point cloud with selected points in new window

[AdvikMehta]

Hello everyone,
I am following this example for manual registration of point clouds.
I know that o3d.visualization.VisualizerWithEditing let's one select points on a point cloud, which can be retrieved by vis.get_picked_points().
However, I would also like to show these points on the point cloud in a new window after selection. I could not find a way to do this, ie, display a window with the selected points visible on the point cloud.

I would really appreciate it If someone could point me in the right direction. Many thanks.