Can't remove devices
I replaced the Bluetooth card in my laptop, and now there are two of each item (MX Master 3 and MX Keys). I cannot delete them. I go to "Add Device", click the X next to the items I want to remove, answer Yes to unpair, and it opens the Bluetooth control panel -- which does not the old items in there because I already unpaired them the first time I went through this process.

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Anonymous commented
Do not install any of the silly Logitech software Setpoint, Options, Options+ Uniyfing or what they call it. They all don't offer the possibity of removing a device
This works:
With a chromium based webbrowser (Edge, Chromium or Chrome) navigate to https://logiwebconnect.com/
Select the receiver
delete the devie