https://wccftech.com/one-ui-2-0-beta-confirms-that-samsung-galaxy-s11-will-have-a-120hz-display/

The Samsung Galaxy S and Note series, for all their accolades, are still behind the curve when it comes to high refresh rate displays. Yes, Samsung makes the best AMOLED panels in the world but refuses to push higher frame rates on it, for reasons best known only to them. However, some leaks that emerged in the past months hinted that the Galaxy S11 would feature a 120Hz screen. It'll bring the Galaxy S11 on par with the Razer Phone 2 and ROG Phone 2.

Today, seasoned leaker Iceuniverse dug through some One UI 2.0 beta code and stumbled a toggle in the settings that enabled a high refresh rate mode. There’s an option in the display settings called “Best Display” and “Save Battery,” which toggle between 60Hz and 120Hz. The Best Display is 120Hz and it says “Always use 120Hz for the smoothest possible display. This uses more battery than usual.” The description for Save Battery reads “Save battery by automatically switching between 60Hz and 120Hz based on the apps you choose and the content currently shown on the screen.” Considering that no existing device has capable hardware it is reasonable to assume that this toggle is reserved for a future device.