Hi @paulo …
It’s easily doable using code. You can query the database where u store the submitted details of the user when the page or site loads. If the query result is true, that means the user already submitted the data and then u can with code, not show the one time popup. If the result is false you can show the one time pop up. For this to work the user should be logged in so that we know the user Id and use that to query the database. Let me know if u need further help…