I think I understand the confusion, we're talking about 2 different things.
The screenshot above is of the Galaxy map when you interact with it, where you can click on a planet to travel there (so fullscreen).
Sith Holocron's mod has a replacement of the panel that you see when you're standing in the cockpit, so a small part of the wall that you can click on to get to the interactable map.
You would have to download those mods separately.
As I said, the planets are only icons. Meaning they are just images, the other mods tell them where to go.
As stated in the description. These were designed with the Widescreen UI Mod in mind. So I can't tell you how they will look without that installed.