I don't know how to change the FOV of the preview camera, but you can create a new camera from your current view in the "Tools" section of Redkit, change its properties to change the fov and then preview the camera. This will give you the opportunity to use any fov you want.
Now I know how change FoV during preview a loaded world... But what about changing FoV in free camera during gameplay in REDkit? Please, look at the screenshot. In top left corner are info about position XYZ of free camera, FoV (default 70) and camera movement speed. Right corner shows time speed (can be changed by + and - easily). So there should be a shortcut or options to change FoV too. Otherwise why that information would be there? Anyone knows? Thanks!
theCamera.SetFov() seems to apply to the 3rd person cam only.
But I managed to change the Fov of the FreeCam using OllyDbg. Maybe I can create a tool. View attachment 5636
Thanks for suggestions. Well there should be way how change FoV directly in REDkit, not in 3rd party software that actually hack the exe (if I understand OllyDbg correctly)=D