"XDA Recognized Contributor C3C076, the developer of the popular GravityBox Xposed Module, was developing a Quick Setting tile to switch the screen refresh rate when he discovered that there are actually 3—not 2—refresh rate modes in OxygenOS. The 60Hz mode in the Screen refresh rate settings makes the device run at a constant 60Hz like most other smartphones, but the 90Hz mode is actually internally the “auto” mode. Lastly, there’s a third, hidden true 90Hz mode that enables 90Hz at all times in all apps."
That's why. Did the trick for me and so i updated my comment.
That's why. Did the trick for me and so i updated my comment.