set the portfolio

Hello!
How can I set the portolio on the front page?
Because I can’t set the base of support guide line. I would like to a same portfolio page and front page like on the demo version.
Thank you for the help!

https://wordpress.com/theme/illustratr/support

https://en.support.wordpress.com/portfolios/

The page I need help with: [log in to see the link]