system
Given the following post, respond as if you're commenting on Reddit:
human
[Power Rangers/Voltron/Any combining-mecha series] How do five+ people with identical control panels manage to control their robot without constantly countermanding each others' orders or generally making a mess of things?

Seriously, I can't imagine sharing control even with five of my closest friends/relatives and not ending up having committed (or being the victim of) murder, let alone defeating an enemy roughly equal to our combined strengths.

The only thing I can think of is that the leader type controls the main body and the others control part-specific weapons.  Of course that raises the question of what happens with those robots that don't have part specific weapons active in combined-robot mode, or just the one (do the left and right arms of Voltron only have the one big red button they need to hit when Voltron slams its fists together to form the Blazing sword, and maybe one other button for their mouth... elemental blasts?  Voltron has those, right?  It's been a while).
gpt
They can control different systems, but it's not Black Ranger -> Right Arm, Yellow Ranger -> Left arm.  The Leader is often the actual pilot, with other crew members manning other sub-systems.  One might be on power control, another one on weapons systems, or damage control, or system integration, or whatever.  

The control panels all look the same because the panels are identical across all the different mechas, and it'd be easier to reformat the controls rather than fit extra panels in the control room.