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MacOS Accessibility Cursor
(i.stack.imgur.com)
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Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
IIRC, the windows version of this is a setting where you can hit CTRL and it makes a moderately large circle that contracts towards the pointer. It's been in since at least W7/Vista, possibly XP. I've used it on and off for years (especially with 3 27" monitors) because of how easy it is to lose the cursor.
And that functionality is in Gnome, but disabled by default IIRC. I've had it on for years in both PopOS and Debian so I may be wrong but I do believe it's a Gnome feature.
It's within the accessibility features