In pre-Creo releases there was the fantastic option to create a regular sweep using a closed trajectory and an open section.
The system then presented the option "Add inner face" to create a solid this way.
This was a very convenient feature.
It is very sad that this feature is deliberately omitted in the Creo versions.
Modernizing the GUI should not lead to a GUI for dummies or to lesser functionality.
Best regards,
John Bijnens