Game spreads perfect hor+ borderless (see uglier Fullscreen Described *).
A. FOV proper. All aim & text are proper. HUD proper, on center. Rendered cutscenes & QTEs full hor+, FMVs (rare) pillarboxed.
B. Menus all proper on center (some with hor+ backgrounds; some pillarboxed, including the campfire screen).
C. All pillarboxing is removable in borderless, but at high cost (see AspectRatio Fix).
(PLP screenshot; hair etc maxed, except pointless stuff e.g. DOF=Off for clarity)