Ah, my bad. That's clear in the docs.
I've uninstalled the AMD driver, rebooted and am now using the Gallium on llvmpipe driver.
For good measure re-installed the DisplayLink driver.
Plugged the monitor into the USB 3 port, ASUS logo appears then goes black screen, still not visible in System Settings to enable.
I've uploaded the latest support info based on using the Gallium driver.
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