Really surprised this isn't in the program, honestly. No shade, just thought it would for sure be a feature since some of the game profiles within Aim Labs have this feature within the actual games.
Not only this, but also an option to set DPI X and Y axis individually to accurately generate the 'same' sensitivity across different game profiles.
For example, I currently have my DPI @ 900X 950Y and 1.04 X 0.91 Y in Marvel Rivals. As it is now, I can't get my exact sens in any form, just an approximation; only allowing me to enter 900 DPI in general, and only the horizontal sensitivity in the Marvel Rivals at 1.04. Not to mention, Aim Labs does not take into account the FOV differences across games.
#X and Y axis as independent sensitivities
full tapir
dreamy maple
Game profiles usually have the separate X and Y if that game has them. The Marvel Rivals profile probably forgot to be set up for it. You can set Y-Axis Sensitivity Ratio to Custom, then set how much faster or slower you want the y-axis sensitivity to be. Set this to 0.875 (calculated from the two sens values 0.91 and 1.04) if you set the sensitivity value to 1.04.
In Aimlabs your Mouse DPI should still be operating at 900X 950Y. When you set it inside of Aimlabs, it's just to get an accurate 360 distance reading. It's fine having it set to 900. If you don't want to use 900X 950Y inside of Aimlabs for whatever reason though, the 0.875 value mentioned earlier will need to be scaled further by 950/900, becoming 0.92361.
Aimlabs does take the FOV into account, but it depends on the game profile. If the game you're playing changes the cm/360 with the FOV, then Aimlabs will do the same. If you want Aimlabs itself to take FOV into account no matter what, enable the Hipfire and ADS Scaling feature, where you will be able to set an FOV and cm/360 combination, and it will automatically set your sensitivity for your current FOV. The combo you set should be for first-person, so you may need to find a good combo first.
Marvel Rivals is third-person, whereas most tasks to play are first-person. Unfortunately there isn't much that you can do there for sensitivity except approximate. You will need to find a higher first-person FOV that feels equivalent to Marvel Rival's 90 FOV third-person. For reference Fortnite players like to use 103 FOV, and Fortnite has 80 FOV third-person, but i'm not sure how similar the two game's third-person camera locations are. I would start with 103 FOV, and if your 1.04 sens's cm/360 still feels too fast for it, try a higher FOV, and if it feels too slow, try a lower FOV.