100k probably just isn't as dense as you'd intuitively expect. As a sense of scale, 100,000 pixels is just shy of 5% of the pixels on a typical 1080p screen, so even with a radius of a few pixels per star, there will still be quite a bit of negative space given all the overlap.
It should:
> It shows the location of 119,617 nearby stars derived from multiple sources, including the 1989 Hipparcos mission.
Seems does. It shows when you click left-upper "statistics" button and zoom out. Their centre is the Sun, not the universe.