the layout disappears in the catia

[Hubble]

Hello.
I reopened a cat file where I was assembling, until a few days ago, a set in top-down mode. reopening the layout I had inserted disappeared or better you see a gray layout. I didn't move any files so, how can I see the layout again?This is the case:

 

[gianni55]

you are in wrong display mode: set shading mode with material

 

[Hubble]

Thank you very much, you're right. forgive ignorance, I am still at the first steps