Oh, I see what you're saying. Yeah, as many times as I've watched the movies, I still don't know what buttons they're pressing in that cockpit. It looks like a hot mess in there. hahaha
Over the years, I just figured that the technology in that universe must be sorta like how people nowadays handle the different types of technology here in the real world. If we give a Windows user an Apple computer or vice versa, the users can figure out basic things like how to turn on the computer, how to type things, and how to use the internet and figure out where to go to change settings, but the awesome shortcuts and other gimmicks of each OS might be too tricky to figure out unless they have a certain amount of experience.
The bits of pieces of info are coming back to me about TFA. It was hinted that Rey already knew how the Falcon worked. I remember her explaining to Han how her boss (forgot his name) added something to mess with the hyperspace drive. Also, she knew exactly where to go to fix the leak of that toxic gas stuff. Seeing and hearing those clues made me think in my mind that she knew the ship for a long time.