My setup is: high DPI laptop screen (main) and a second, lower DPI, monitor (second).
The Visual Studio "main window" is full-screen on the second monitor.
All the NCrunch tool windows (tests, metrics, configuration, etc.) are grouped together, un-docked, on my main screen.
see photo:
https://ibb.co/02QX1Bt
As you can see, the Additional files window is tiny. However, I've just noticed, if I drag it any amount, even just a few pixels, it jumps to being regular size.