Show the scene. The size of the depthmap depends on the size of the scene.

The infinite light positions its light to cover all items in the scene. If it is large you have to increase the depthmap accordingly - or - position the shadowcam to cover the area where you want to have shadows with the x,y translation and the scaling the shadowcam down

Example: If yoou have only one figure in the scene, the mapsize of 1024 is sufficient. However if you include a city around it with the same scale, the mapsize needs to become huge to see the shadow on the figure because it now uses the map to show shadow details of all the buildings as well. However - if you zoom in with the shadowcam onto the figure with the translation dials and the zoom, the shadow will return. Anything outside of the shadowcam will now have no shadows

That's why raytraced shadows are a lot easier to use