Dorico is indeed the best friend of those who like to change their mind — or fix mistakes without having to rewrite everything (and I’m a Finale refugee too!)
Here is just a simple example of the different ways you can rewrite music in the middle of a piece. Piano and flute. Five different results for the exact same correction: I’m just entering a quarter note in the right hand of the piano, bar 2 beat 3. It shows that every possible scenario has been planned:
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Without insert mode: as @asherber and @k_b were saying, it overwrites the existing music. Nothing moves.
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With Insert Mode:
a. Insert (voice): Only the voice I’m correcting is shifting to the right. Here, the right hand of the piano. Piano left hand and flute don’t move
b. Insert (Player): All notes of the player move: here, both staves of the piano. Flute doesn’t move.
c. Insert (Global): All the instruments move
d. Insert (Global adjustment of current bar). Like the previous one, all the music moves, but also the next barline, and the Times Signatures are adjusted.