In your image it shows Relive tab. Under that tab you should see a Remote Play setting even if Relive wasn't installed or when you click on the Relive tab does it ask you to install Relive in Radeon Settings?
That Reddit was for Adrenalin Driver not Crimson. Disabling the Remote Player has fixed the issue of Eyefinity Tab missing on several User's computers including those using the latest Adrenalin drivers at that time here at AMD Forums which is why I posted the solution.
But the point is moot, you got it fixed by downgrading the AMD Driver.