[silverscreen]

Originally Posted by lspintzyk

Great!

You need to follow the article:
https://support.displaylink.com/know...lay-is-working

tl.dr
1. Uninstall DisplayLink driver first
2. go to recovery mode
3. invoke kextcache command as described in that article.

Based on the title I thought this KB article was not relevant, but it fixed the first problem. The extension is now loaded and I have a mirror of my main monitor.

How to switch this from a mirror to a extended screen (as I had before)? Reconnecting the USB doesn't fix the issue. The Airplay icon is not visible and the only option for AirPlay Display is Off.