On the FPCamera prefab, located in HorrorEngine/AddOns/FirstPerson/Prefabs. There is a component called FirstPersonCamera where the camera behaviour can be tweaked.
For each character state a camera config can be assigned. By default, DefaultConfig will be used if not state config can be found.
To define which config affect which state, the component uses state tags (Check player states where these are defined).
You can tweak FOV, Distance and Offset for each state and the config will change at a rate defined by BlendSpeed. Additionally, if the player should loose control of the camera movement and match the animation you can select the option MatchAnimationLook.
Depending on your input scheme different sensitivity settings will be used.