How can I change the size of the load arrows?
Right-click the arrow and select "Increase Size" or "Decrease Size" in the context menu.
Detailed settings are available in the Display Properties, which you can access in the load context menu, too. It is possible to adjust the position, size, color, etc. individually for each load object.
Furthermore, there are limit settings that apply to the size of the load vectors. They are aligned with the size of the entire model. You can check these limits with the [Settings] button, and if you want you can change them, too.