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Microsoft in their infinite wisdom has replaced the Hide Desktop icon with Copilot.
(programming.dev)
This is a most excellent place for technology news and articles.
Monitors at different refresh rates is a downside of x11, which Mint uses for all its desktop environments. Fortunately, they're working on moving to Wayland for the Cinnamon edition, which has better support for that. There's an experimental version you can use now, and they plan to be done in 2026.
I'd test things first ofc, maybe with your laptop plugged into one of the monitors.