Hi, I had this problem for a long time and i wanted to investigate this.

My sensivity between 1.8.9 and 1.16 is different. 1.16 sensivity is way too slower then 1.8.9.

I mainly play 1.8.9 but sometimes i go to play some survival (1.16.4) and i need to make my sensivity higher. 

I use %20 sensivity in 1.8.9

                but,

I use %48 sensivity in 1.16.4

But they feel the same 

How can I solve this?