Why they have this MegaScans button on the tool bar?

I was watching a Quiexl MegaScans introduction video, and they have this MegaScans green button next to the setting. How can I get this and what does this for?

This button is added automatically by LiveLink when you use “Export Settings” from within Megascans.

Here’s a nice explainer/tutorial from Quixel:

Thanks for this, really helpful.