Big Sur Upgrade and what worked for me

[Darover]

I'm not such lucky.
I've Tried everything. Also, removing ( - ) the displayport from recording screen section.
Reboot, ungplug, plug, add recording screen again. Uninstall, install.
No luck.

Even one dongle screen is attached and working. Second one is completed black. And the Displayport menu shows "No Monitor Detected".
(Macbookair M1)

Still looking for a resolution

[anthlover]

You do not list all the hardware and software involved. In particular what Hub or adapters you are using. The displaylink software only works with dispaylink based chipsets found in many hubs. Straight thunderbolt docs will not work.