.graffleshapes location? want to create arrowhead

OmniGraffle OmniGraffle for Mac
#1

Been trying to find this file but no luck.
My goal is to create a larger arrowhead

#2

Found the shapes.graffleshapes file, inside
Contents⁩ > ⁨Frameworks⁩ > GraffleShapes.framework > Resources

now to find out how to make a larger circle