Thank you for reaching out, and welcome in the Community!
This is probably because you are using our Non HubSpot Forms tool. You can toggle that off in Settings > Marketing > Forms > Non HubSpot Forms. You have more information on this in the following article:
This is a all-or-nothing tool. You cannot select some external forms but not the others. If this is something you really want to do, I'd advise to use our Forms API.
Thank you for reaching out, and welcome in the Community!
This is probably because you are using our Non HubSpot Forms tool. You can toggle that off in Settings > Marketing > Forms > Non HubSpot Forms. You have more information on this in the following article:
This is a all-or-nothing tool. You cannot select some external forms but not the others. If this is something you really want to do, I'd advise to use our Forms API.