You can use Components to create a customized version of any widget. Specifically, you can right click on a Note object and then choose Convert to Component. This will create a new screen file with the note. Change the text setting of the note to be left justified and save it. Now you'll have a new component in your palette that works as a regular Note but with different default settings.
I know about components. i'm talking about the default in the annotations menu. I want to change the default settings on the annotation so that I don't have to create a component. Left justifying all notes should be the default as that makes more sense. Users can make the text centered in the rare cases they would want to.