Here is the fix that works on my macbook air 2021 m1 chip, I found this on another chat and put what just worked for me today. Getting 3 External Displays:
Well, something interesting I came across the other day: My J5 USB-C Dual
HDMI Docking Station allows for more then two extra monitors. How
so? Well, plug in my projector to my Mac using the USB-C Digital
AV Multiport Adapter and then plug the J5 hub with 2 HDMI
displays (one 4K),
and I have 3 external screens. It all mirrors and extends. Who knew?!
Well I have to say, this is the best thing ever, I have every since I bought my mac tried to figure out how to do two additional monitors and now I got it. This was a breeze and I can see three different screens and work on each one separately. I want to give a great shout out to you for this suggestion for the J5. One thing to all that may review this, I paid a total $72.21 this was off the $90 price at Walmart in store price. Better to order it from Walmart online you will save money and enjoy the look of having three screens to work with.. I am so excited!!!!!!