How to customize the Portal with "Classic" theme
The main article about the Portal is available by this link.
As for the Portal with a "Standard" theme, a Dashboard is available in the "Classic" Portal.
To switch to the "Classic" portal theme, open the Portal and select "Theme" from the "Portal" menu:
Select the "Classic" theme from the list:
On the Settings page you can change List or tile view for modules and Advanced options.
The logged in user will see a portal as similar to this:
If your authentication type is ‘No authentication’ or ‘Basic HTTP authentication’, your web user does not need an account page. Also, such web users will see portal modules as Widgets so you can control their look in the ‘Widgets’ sections of every form, table, or report.