The value of Multiplier 1 is fixed at 2.2.
The value of Multiplier 1 cannot be changed.
It seems to be a bug.
In the Convert from area, you can enter a value in the text box, but in the Convert to area, the text box is grayed out and you could not enter it.
What is Multiplier 1?
Thank you.

Multiplier 1 (Mouse Sensitivity) is the value that is being calculated for you, it is not fixed. It is based on Sensitivity 1 (Sensitivity Scale (Horizontal)) as well, so you can lower this to get a more precise value (for instance set it to 0.4 instead of 1).