I'm currently developing a program and I have this that shows up at the top of the window. I don't know what it is or how to remove it. I only have it in this specific program so I guess it's related to something I have done.
This is normal when running a XAML window in Debug. It let's you debug the window. If you build in release mode, you'll see that this disappears.
If you want to turn it off, uncheck this option in the settings Tools –> Options –> Debugging –> General –> Enable UI Debugging Tools for XAML.
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