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Pressing some key a few times in Windows highlights your cursor. I just can't remember what it was (Ctrl I think)

Yup, Ctrl twice.

Once works. It's an option you have to turn on: Settings > Mouse > Additional mouse options > Show location of pointer when I press the CTRL key.

Oh thank you thank you. I moved to Windows 11 and the feature disappeared - it is right where your path points to.