Hello @alice alice,
If you are talking about the keyboard shortcuts in Visual Studio, you can click Tools > Options > Environment > Keyboard and try to remove and then assign the related shortcut keys again.
Reset VS general settings might also work.
Maybe also try (Ctrl + K, Ctrl +/), or simpler, (Ctrl +/) as a temporarily workaround.
But I doubt if the key combination is interfered by other applications, extensions, keyboard or limitations...
Sincerely,
Tianyu
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