Answer:
The distance between the arrows depends on the FE mesh. It cannot be changed in the Display Properties.
The calculation provides a result value in each FE mesh node, so that a value of the line support and therefore also a support arrow are available in each FE node.
You can only change the interval between the arrows by means of the target length of the FE elements. To do this, use the drop-down menu Calculation → FE Mesh Settings.
