Accept or reject changes
Nothing the assistant writes is final until you accept it.
Every change the assistant makes is highlighted on the score. Compare it with Before, then press Accept all to keep it.
Not what you wanted? Press Reject and the score goes back to how it was. You can also keep chatting and ask for a different version before you decide.
History
History in the editor header lists the project's changes and imports, newest first. The number on the button is how many entries there are.