Using "Scores Notes To MIDI"
For very complicated scores, there may be situations where you have tweaked the parameters for Display Quantize and Interpretation as best you can, and you still cannot get the score exactly as you want it. Perhaps one setting works fine in one section of the track and another is needed for another section.
In such a case, “Scores Notes To MIDI” helps you out. It changes the lengths and position of some or all the MIDI notes in the edited parts so that they have exactly the values shown on screen.
Procedure
Result
Now that the notes have the exact lengths and positions that were previously only displayed, you can probably deactivate many of the options on the Staff page of the Score Settings dialog and delete Display Quantize settings, etc.
If you find the operation did not give you the result you were after, you can undo your settings or go back to the original track, make a copy of that, and start over.