Adobe Portfolio HELP - I am having difficulty with using templates!

Don't try to re-design a Theme.  Use another Theme instead.

There are 12 Portfolio Themes to choose from. 

https://portfolio.adobe.com/themes

Theme Features:

https://help.myportfolio.com/hc/articles/360035995733-Themes-features

Theme Comparison Chart:

https://help.myportfolio.com/hc/articles/360035496294-Comparing-themes

Website Container Sizing:

https://help.myportfolio.com/hc/en-us/articles/360036870474-Website-Container-sizing

Hope that helps.

Try the several Portfolio links in https://community.adobe.com/t5/download-install-discussions/is-portfolio-still-being-developed/td-p/11583268