Hi,
what you looking for is single portfolio page. First you need to add your portfolio pages in your Dashboard\Portfolio. Don’t forget to add featured picture in portfolio pages and create Portfolio categories. After that for example add element Portfolio when you editing home page or some other test page and there you can add categories that you create. If you don’t add categories then Portfolio element will show 8 portfolio on front (edit Portfolio element and you will see option Count is set to 8). Then, when you open front of that page what you create, click to any of that portfolios an you will see single portfolio. Breadcrumbs part is in the header and there you have title of single portfolio (Project Tittle like you can see on our demo site), please find Breadcrumbs options when you open Customizer on tab “Breadcrumbs” where you can add your breadcrumbs image and hide breadcrumbs or hide just breadcrumbs title. For Related Projects part: you need to edit your single portfolio and when you scroll down you will se option “Show Related items”, just check it.
I hope this help you :)
Kind regards