Update – Append “/_services/about” to the portal URL ==> O
Restart the portal from Portal Admin Page
Recently while working on web form configuration we made few changes to the form that was being used in web form step. However, the changes we made were not getting reflected back in the portal.
We had added the 2 controls in Step 2 tab in the form, however the change was not getting reflected back in the portal.
In the portal,
To refresh the website with the latest CRM changes, we can go to the Dynamics 365 Administration Center
And change the portal state to off – update and back on – update.
This updates the portal page with the latest changes
Also refer this document
Hope it helps..