Hello!
We are using the submenus of the Appian sites (which only accept interfaces). We have a logic where, depending on the role of the user that accesses, when clicking on the submenu of the site you will see one thing or another:
Do you know if there is any option to do this? Thanks!
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What Mike suggested seems fair.
However if you still want to show recordview(summary for example), you can display all other tabs as relatedaction/custom links on that view/interface.
For showwhen, you would follow similar condition provided by Venkat, and display your Default view.
To display other view which I assume can be converted to(richtextdisplayfields) and route them to those other interfaces/tabs. Even this would require some development effort. This will not display everything in 1 place.