Mr. Laser Beam wrote:
From what I hear, the ST IV bridge for the Ent-A was never intended for full-time use, it was just something they literally threw together at the last minute just for filming that one scene. Who knows, that may have been true in-universe as well!
That's exactly what happened -- the Enterprise
-A bridge in Star Trek IV
was a redress of the TMP
onward bridge set, painted white. What we saw on screen was literally the one angle from which it could be shot. There's a picture of it that shows the point where it becomes "unfinished" with the older beige color scheme.