Why does Windows 10 think that my WPF application is a game?

I have a line-of-business .NET Framework 4.x application written in WPF. When I start it, Windows 10 briefly shows the XBox game bar:

^{If you don't recognize the image: It looked differently before the Windows 10 1903 update.}

So, apparently, Windows 10 thinks that my application is a game. I think that's hilarious, but I'm afraid that my customers might disagree.

How does Windows determine whether an application is worthy of a game bar or not? And how can my .NET application tell Windows that it isn't a game?