Hello @bocapio

Hope you are doing well. Apologies for the delay in replying to you.
Now for importing layout as demo you need to manually Import prebuilt layout.
For this you need to create a new page name it as you would like and then do as shown in image below.
http://prnt.sc/b66tt3

After that: http://prnt.sc/b66nc9
Then you will below image: http://prnt.sc/b66odv
After this you will see automatically sections being added in that page.
Now as you scroll down the page you will see Theme Settings. Now do as shown in the attachments below.
http://prnt.sc/b66ozk
http://prnt.sc/b66p37
http://prnt.sc/b66p6w

Now finally below screenshot: http://prnt.sc/b66swc

Hope this will help to resolve your issue.
Let me know how it goes.

Regards!!!!