Disable "Enter" Key Stroke on Text Entry Question

Hi All,

I am working on a free form question interaction that is a text entry question.  I understand 256 characters are permitted in this type of interaction.  I noticed that if I hit the Enter key to advance to a new line within the text entry box, the "Thank you" layer pops up prematurely, before the interaction is submitted.  Is there a way to disable this?  I think learners may hit Enter to advance to a new line if they are typing.  We are not trying to track the response as correct/incorrect so I just chose a "Thank you" layer once the interaction is completed.  As I understand it, our LMS has the capability to see what people have typed--we don't need it graded.  Maybe I just have my question set up incorrectly.  If there is a better way to do this, I'm open to it.  Thank you!