When Andrew Probert designed the Enterprise-D’s saucer separation, he came up with the idea of a battle bridge for the part of the ship that would fight.
“Originally, the producers did not want a battle bridge. That was essentially my concept,” he told Star Trek: The Official Fan Club Magazine in 1988.
The battle bridge would have to cannibalize the Enterprise bridge set from the motion pictures. Probert came up with a 24th-century update, which was seen in “Encounter at Farpoint” and “The Arsenal of Freedom”.
The set became the original Enterprise‘s bridge again for Star Trek V: The Final Frontier, after which it was destroyed in a weather accident. A new battle bridge had to be created for “The Best of Both Worlds”. It used elements from the Enterprise-C bridge that had appeared in “Yesterday’s Enterprise”.