Define an Itemid for display message

I call a "display message" on submit, but the page with the message is loaded with the "home page" style. How can I add a "Itemid" for this page to load it with a different style?
Thank you.
cmc

Hi cmc,

You can create a hidden menu item for the form On Submit event and add that to the Form Action URL in the HTML (render form) action.

Bob

Thank you very much. What kind of menu item do I have to create?
a "ChronoForms5 form" (that point to index.php?option=com_chronoforms5&view=form) or an EXTERNAL URL to index.php?option=com_chronoforms5&event=submit
Thank you.
cmc

Hi cmc,

A menu of type ChronoForms - so that you can get a menu URL - but 'hidden' i.e. not added to a module so that it is not shown in the template. You need to specify the on_submit event, then add the URL to the form Action URL setting so that it is called when the form submits.

Bob