last time I used this the arrow length was proportional to the load to provide some indication that you are hitting what your are aiming at. However, if memory serves me you had to exit out of the specification dialog to get it to show up.
The arrows will proportionally be shown on the model once you define nonuniform pressure.
Please see this for reference: SOLIDWORKS Support Monthly News – November 2015 | The SolidApps Blog
do you need another visualization?
I'm just used to an "applied force" plot. It's nice to see the applied loads visually as color plots, and be able to sum up the applied force on an area using a tool like "List Selected".
Thanks for your responses.