Note insert in the Notation view is unusual and takes a bit of getting used to. Generally, if you enter a note on the first beat, it will appear to take the entire bar - plus some (about 7 beats), until you either enter another note or a rest later in the bar, which will then truncate it.

As for the note length, mine defaults at 6 beats 42

I never worry about it because the note length will truncate to fit whatever else is later in the bar. It's different, but quite versatile.

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