Customized confirmation pop up message??

[Leonsk2037]

I searched a few similar posts, and also found an example AppSheet app called Confirmation Message:

The popup message in there has a text and one close button, however when I try to do exactly the same thing, it ends up being this:

I can customize that close at the bottom right by changing the close action name, but is there a way I can get rid of that NO at the left? Just curious lol, thanks!