This has been a feature on my Mac for some time. If my second screen is powered on the icons look like this:
Everything still works, but it's a bit tricky to navigate!
In the past I've fixed it by just switching the 2nd monitor off, but I thought I'd mention it here. Does anyone else see this? I'm using the latest most up-to-date software for everything (Feb 2022), Mac and Garmin, but it's been behaving like this over many versions.
Thanks, Keith