arrow line in pen tool
Now that we got dashed and dotted lines, I think it would be a great improvement to add the option of an arrowed line, just ending the line you're making with an arrow, I find that this would upgrade the note taking experiencie and a lot of people would find it very useful
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Bob Hume-SR commented
I agree. Rather than having to select the shapes tool to draw an arrowheaded line, with the line tool one could just draw a line from one point to another and then, for example, draw a little circle at the end of the line. GN could turn that little circle into an arrowhead. Another way this could be done is to draw the line. Then, touch and hold the pen at the end of the line that will get the arrowhead.
In addition to not having to choose a different tool, and then reselect the pen tool, this would give greater control over the route of the line of the arrowhead since the shapes tool has predefined smoothing of the line. The pen tool can go anywhere to draw a line. This would just add an arrowhead to the end.