Why can’t I find Miracast after upgrading Android KitKat 4.4?

Why can’t I find Miracast after upgrading Android KitKat 4.4?

After upgrading KK, the “Miracast” function is replaced by “PlayTo”, whose function remains the same.
To access the function, plse refer to photos below.
Versions prior to Android KitKat 4.4:
1. Quick settings
2. [Settings] -> [Display] -> [Wireless display (Miracast)]
Android KitKat 4.4 version:
1.Quick settings
2.[Settings] -> {Wireless & networks} [More] -> [PlayTo]