Changing time signature on existing piece

Current piece is 3/4 with all quarter notes, but we need to switch it to 6/8, combining two measures and changing note duration. The trouble we are having is that it keeps auto-filling with rests or other notes. Is there a way to turn that off?

  1. Change the initial time signature to 6/8 (don’t worry about all the notation changing)
  2. Engage Insert Mode (I)
  3. If it really is only quarter notes, select all and just change the duration (5). If there are other note durations mixed in, use Write>Edit Duration>Halve note duration instead.

If your score is actually more complex than you suggest this might not work 100% and we would need to see what you are trying to do.