How do you generate a 'central note' like the Habits MOC displayed on the frontpage graph view?

Things I have tried

Searching the forum for topics on ‘center note’ and ‘central note’.

What I’m trying to do

On the front page of the website, below the App Store and Google Play icon, there is a screenshot. The graph view of that screenshot has ‘Habits MOC’(with pink) and a lot of other notes connected with it.

How do I generate a central note like Habits MOC where everything is linked to it and how do I give that dot a pink color?

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