Hello, Hope you doing well

I want to add template which I made a full-width page and put inside of expanding contecnt cards. 

I find inside of items I can choose 'Template' as Sub Content Source. which I choose sub content as page template I made. Which only partial part is appeared not a full page. 

Is there any way that I can add full page Template inside Items? I'd like to change width of items inside of the each item. 

Please let me know. Thank you.