I am having the same issue. I checked all the settings and restarted multiple times. I also uninstalled and reinstalled with restarts after each action. It kept mirroring the displays. The mouse could move over to the second display, but I could not interact with anything. Only on the primary display could I select anything. It was an odd mixed state. FWIW, I do also have my laptop open, so I am using 3 screens in total. I am on macOS 10.15.4. After wasting almost an hour trying to get it to work, I ended up going back to 5.2.1.
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