Welcome to the neighborhood.

You should be able to edit a single note by right-clicking on it and selecting Edit, or by click-hold and moving the note.

In the 2nd method, watch the note value in the display at top of the staff when releasing the mouse button.

(You must be in editable notation mode first)

BiaB has an interesting way of adding notes. Generally, it will fill the bar with a longer note until either another note or a rest is placed somewhere further along the bar.

Also, check that you have Mono mode unchecked. This may make a difference to the layout of the notation you are adding.

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