Disabling the submit button after use

Hi, Ive made some content in Articulate storyline 2 for e-learning, Ive inseted some questions (which work great) but i was wandering is there a way of making the submit button disabled after its been used? Ive inserted a question and the feedback layer comes up with a next button ive built into it, but ive found some users are still pressing the submit button at the bottom of the page on the layout (eventhough its already been pressed) So i was wandering is there a way of getting rid of it after the questions been marked?

Thanks in advance