Answer:
Right‑click the load arrow and select the "Increase size" or "Decrease size" option in the shortcut menu.
Detailed settings can be specified using Display Properties, which you can also find in the shortcut menu of the load. For each load object, you can individually set the space, size, color, and so on.
Furthermore, the size of the load vectors depends on the limit settings, which are relative to the size of the entire model. Click the [Settings] button to check and modify these limits, if necessary.
