Hi @Gilles 

Please refer to below post

Hi @Gilles , I’m sure @krbhavya response will resolve your issue. if you still face any issue, please let us know. Thanks!!

Was there any resolution to this? I also need to change the Next button to a Submit button on the Table of Contents conclusion page, not the last page of the survey which is different.

​@Skolar248 Add this JS to any question on whichever page you want the next button to say somthing else.

Qualtrics.SurveyEngine.addOnload(function () {
	const nextButton = document.querySelector("#NextButton");
	nextButton.value = "WHATEVER YOU WANT IT TO SAY";
});

The Table of Contents Page at the end of the survey doesn’t have any questions on it, it’s a page that Qualtrics generates if you select the “Add Table of Contents conclusion page” under the Table of Contents element in the survey flow. I’ve already tried adding code to the final survey question, it changes the next button text on the last page of the survey, but not the next button on the ToC page. Maybe changing the text of the next button on this page isn’t possible?