Both ship and SRV interface elements are positioned in such a way that they are fully visible regardless of your aspect ratio. Not so for On-foot HUD elements. They are positioned in such a way that many of them are cut in half or completely invisible should your display/window aspect ratio be narrower than 16*9. They don't move closer to the center to account for narrower view area. Which is bad, because suit charge and item wheel can't be seen, and info panel is only half-seen.