To get even more value out of line tool arrows, we can make a preset to quickly recall our settings. The preset will not only remember the arrowhead settings, but it will remember the color and layer style that you use with your arrows. I want to make a plain blue arrow preset so I've got blue selected as the foreground color, and I have no layer styles selected.
At the left end of the option bar there is another little triangle. Click on it to open the Tool Preset picker.