Here is an easy tutorial on how to disable the system and stock apps on smartphones running on MIUI 10 based on Android 9 Pie, Android 8.1 Oreo, and Android 7 Nougat. Using these steps you can disable apps like Mi Pay, Google Music, and Google Movies apps, which will save internal memory and RAM.

Download MIUI Hidden Settings app here

https://play.google.com/store/apps/details?id=com.ceyhan.sets&hl=en_IN