You can enable “Edit Active Part Only” in the Key Editor toolbar (Multiple Part Controls toolbar option in Cubase 11), which allows you to select the Part to be edited. However, if you click on a note from another Part with the Object Selection tool, it changes the Part you are editing to the one that note is in. All the other tools, like Trim and Erase, only affect the selected Part.
So if you need to move an overlapping note, it can be annoying. If it’s a strictly quantized song, moving with left/right arrow keys between notes (requires disabling Step Input) and using the up/down arrows to transpose and Ctrl+left/right arrows to move the note in time is an option.
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