Locking positions of lines

Is there a way to stop lines from moving whenever you add elements or other lines to a to a notehead. It would be great to be able to lock lines in place to stop them from moving.

For instance, I would like to add dynamic markings over this passage:

  1. These solid arrows with white arrowheads – are they supposed to point to the notes?
  2. Did you enter them as note-to-note? (the first of each set of 3 icons in the Lines panel)

If Yes to 1 and No to 2 (in other words if you entered them attached to beat positions and moved them in Engrave), you’ll need to delete them and re-enter them as note-to-note. Then they should stay put even over a system break, even when you add other markings.

Let me know if I’ve read the situation wrong.