portfolio onepage ?

@DimC,

Yes and no.  One page sites are indeed possible.  Use the Welcome Page (formerly called a Splash or Intro page).

https://help.myportfolio.com/hc/en-us/articles/360036042673-Adding-a-Welcome-page

Welcome pages are used for special announcements like an art show, gallery event, a book signing, or new product release.  You can have up to 5 Portfolio sites running at the same time, each with their own separate URLs. 

Optionally, you can connect your Welcome pages to your main Portfolio site with  hyperlinked buttons or text. 

Portfolio Pages explained:

https://help.myportfolio.com/hc/en-us/articles/360035998273-Page-types-explained

Hope that helps.

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