Problem with Space Shuttle

[Juan11Pessoa]

This may be a dumb question, but I'm a beginner in the game and I'm doing a space shuttle, but when I get into orbit it's decoupling the main module bus, I can't control the space shuttle anymore, just the rocket. Can someone help me?

[James Kerman]

Welcome to the forum @Juan11Pessoa, it sounds like both stages have a probe core or manned capsule? If so you can switch between vessels using square brackets on your keyboard '[ or ]'.

I've also moved your topic to gameplay questions.

[ZooNamedGames]

Sounds like your root part is a different part. Try using [ or ] as @James Kerman mentioned to cycle until you can control your shuttle. Make sure it has a command capsule or probe to provide control!

[Gargamel]

As mentioned, it sounds like your booster/tank has a probe core on it.   Unless you intend on recovering the stage via mods, there is no real reason to have a probe core on it.  Remove that from your build and the game will default to the shuttle as the main vessel and you have to even worry about the problem again.