What about this question?
It is the same as removing the blue rectangle, but leaving the items in it blue.What to press to change this timeslot selection to only note head selection?
Yes.I assume this is an early-ish 20th Century piece?
You should analyze (it is easy) what time signature match the music in a measure.How can you make a single line of notes feel as if it is in two times at the same time?