Question Why does the freesync option not show up in my monitors setup menu

[R fooks]

My monitor (iiyama Gmaster, GE2488HS) is advertised as being freesync compatible (via HDMI) but there is no option to enable it, the user manual shows it in the setup menu but this is not the case.

 

[rgd1101]

and your gpu is?
What is your full system spec

 

[R fooks]

and your gpu is?
What is your full system spec

and your gpu is?
What is your full system spec

CPU: i5 4460
GPU: RX580 8GB
MOBO: Gigabyte H81M-S2H
RAM: 8GB

Could one of my components effect what shows up on my monitors OSD?