Hi I made a prefab with to game object together but no arrow apeared, when I drag it out to the Hierarchy
Here it is:
both game objects appear.

Hi I made a prefab with to game object together but no arrow apeared, when I drag it out to the Hierarchy
Here it is:
both game objects appear.
Try do it with a box, get that working. Then try doing it with your arrow. You can select any GameObject in the hierarchy, then press F with your mouse cursor OVER the scene window to find it.