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Same here. This happened to me with a compact keyboard. I ended up using the built-in Accessibility settings to remap a key, which worked without any extra software.

This. You could also look up "Resource Monitor" in the Start menu—it gives a more detailed, real-time breakdown of memory usage than Task Manager.

Short answer: There's no official word on a true black theme yet, but you can submit this as a feature request in the Feedback Hub—that's how Microsoft often decides what to add next. Curious what others think.