In the game you find the setting under Options → Controls → General → Sensitivity.
Conversion
CS2 to Overwatch 2 Sensitivity
In short: CS2 sens times 3.3333. 1.2 becomes 4. For your own value, just edit the sentence below.
How to set it in Overwatch 2
What changes when you go from CS2 to Overwatch 2
CS2 turns 3.33 times further per mouse count than Overwatch 2. That is why the number gets bigger while your mouse distance stays the same.
Overwatch 2 shows 3.3° less field of view than CS2 by default (103° against 106.26°). The picture looks a little tighter and movement on screen a little faster.
In Overwatch 2 you can enter up to 2 decimal places. Use all of them to keep the conversion exact.
Common questions
How do I convert CS2 sens to Overwatch 2?
Multiply your CS2 sens by 3.3333. 1.2 in CS2 becomes 4 in Overwatch 2.
Where do I set the sens in Overwatch 2?
Options → Controls → General → Sensitivity.
Why does Overwatch 2 still feel a bit different?
CS2: 90° at 4:3, about 106° at 16:9. Overwatch 2: Slider from 80° to 103°. Match the field of view as closely as you can; then the converted sens feels most natural.
Does this also apply to scopes?
No. The values are for hipfire. Zoom and scope sensitivities are set separately in the game.
Should I change my DPI?
No. Keep your DPI and only change the sens in the game. That keeps your feel the same everywhere.