the prefabs doesn't appear in the game view

everything was good but the problem started when I add a spawner and changed some of my objects into prefab then I added it to my spawner object and whenever I run the game the prefabs appear in the scene view, but it doesn't appear in the game view. .... help, please :(,the problem started when I changed some of my objects to prefabs in order to spawn it the problem is when I did that it appeared in the scene view when the game start but not in the game view help pls :(,