I find I initially look at the scene with a wide angle eye, about 135mm in 4x5.
After I study things a while and use composing cards for various focal lengths I find I usually either go longer or try to move in closer to the subject. When I first shot 4x5 my first lens was a 135mm but I was forced to move the camera closer or enlarge just a portion of some images.

Now that I have a more extensive lens selection I can let the subject matter determine focal length and ultimate composition. To think in terms of different focal lengths in LF, I find it helpful to shoot the same subjects on 35mm and use several different comparable focal lengths to 4x5 and then study them later.