This guide will provide you with all the information about Sensitivity Settings in PUBG mobile.
The sensitivity settings, 3rd Person No Scope, is used to locate the enemy from close or long-range, and you will also get to know from where the enemy is firing. You have to set this on 108 %, and then you have to follow the setting from the image given below.
The ADS sensitivity 3rd Person No Scope is used to work in the crossfire, and you can set this from 90 to 120 %. The ADS Sensitivity is used to control the recoil in the game, and you can also follow the other ADS setting from the image given below.
The Gyroscope Sensitivity settings are also given. 
