I'm having the exact same problem, purchased a StarTech USB3DDOCKFT to run dual monitors on two different laptops. Everything works great with the HP, but he MAC Book Pro running 10.15.6. The dual monitors show, but when you try to arrange them, you don't see monitor 2 at all everything is on monitor 1 and is mirrored over to monitor 2. Mouse will move over to monitor 2 but you can't click or use the keyboard on Monitor 2, it's just mirroring the display of Monitor 1.
If I download the Display Link Manager it will work, but you can't use Display Link Manager and have the macbook closed,(a know issue) which is how I have my two laptops on my desk in a stand both closed.
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