Anyone can help my case?
This issue was also discussed in this thread. https://zentalk.asus.com/en/discussion/12914/refresh-rate-option-is-greyed-out/p1
Try clearing cache and storage for your Armoury Crate app.
Tq for your notif. I'll try ?
I have a trick for you see if it works take a screenshot and then try to change it .