I can no get my character to move in showcase mode

Whenever I am in the showcase mode using the top down sci-fi environment. I can place the top down character in the environment, but I can not place the top down controller or top down game mode blue prints. I am trying to have my character roam in the environment, but its not happening for me, please help.

I solved the issue, I had to put the nag mesh around the entire showcase.