The close button on the macOS app’s Getting Started page is displayed in the upper right corner where you can actually click:
(a very small bug 
)
Hi @hahahumble, good spot!
This happens because the titlebar is invisible but there to help you drag the app around, we will fix in a subsequent update 
I also found another problem: my theme was originally automatic, but after I opened the Getting Started page, it automatically changed to the Day Theme.
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