Enhanced Sync used to be in the global graphics settings. Where did it go?
This was a bug that was addressed in Crimson 17.10.1.
I had the same problem.
You need to uninstall the driver completely (with DDU Tool, -> google it) and reinstall the driver from scratch!
It didnt work. I tried both the clean uninstall from the driver and DDU. Still no enhanced sync on RX Vega.
Retrieving data ...