The USB dongle is plugged in. Does this override Bluetooth settings in options? If yes, is it possible to truly turn off Bluetooth connectivity and how would you test that, since the Bluetooth setting itself is toggled off? If not, how is it doing this?
Trying to search for the answer via search engine just gives me troubleshooting to make the mouse connect, which is the opposite of my question.
Is it just a Bluetooth dongle or a proprietary one that came with your mouse, such as with Logitech stuff? The proprietary ones usually work on their own stack or have a secondary RF connection that it uses when BT fails. As long as the dongle is plugged in, they will just work.