In the game you find the setting under Options → Controls → General → Sensitivity.
Conversion
Apex Legends to Overwatch 2 Sensitivity
In short: Apex Legends 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 Apex Legends to Overwatch 2
Apex Legends 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 2.5° less field of view than Apex Legends by default (103° against 105.5°). The picture looks a little tighter and movement on screen a little faster. For Apex Legends the field of view is only a rough guide, check it in the game.
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 Apex Legends sens to Overwatch 2?
Multiply your Apex Legends sens by 3.3333. 1.2 in Apex Legends 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?
Apex Legends: Slider from 70 to 110 (about 105 to 106° horizontal at 90). 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.