I have just finished watching Requiem for Methuselah TOS.
When Flint reduces the Enterprise to a two foot long version we see Kirk (anxious about his crew) peer into the bridge as if he can see inside.
This could indicate that the main viewscreen of the Enterprise is actually a window that acts as a heads-up display.
TREK IS TREK. WHATEVER THE TIMELINE!
The next TV Series should be called STARFLEET!