UNDERNEATH ~ Settings, Modeling Aids; Gumball ~ there is a wealth of fine-tuning available for the Gumball.
Including, arrow Tip length and Tip width
Including, Arc thickness.
The direction of the (small) default arrow tips are not always easy to distinguish against a busy background. However, there appears to be no ability to vary the size of the arc arrows.
Would it not be to advantage if they could be made bigger?
With the x, y and z arrow-tips able to be fully adjusted, would it not be possible also to make the rotational arrow tips adjustable?