Hi jessie0818 ,
Have you looked into the Table of Contents feature? Although it can be a little unreliable when used in combination with other options (like End of Survey Response Summaries), if your survey is pretty straight-forward this may be the solution you need.
Another solution to consider is to generate a PDF or Word file of the full, blank survey, and post that as a downloadable preview at the beginning so respondents can view all the questions before completing it online.

hi jessie0818
I'll preface this by saying I don't do javascript. I try to find solutions using the tool's native features. I think what you want is to make the questions NOT forced response, but you don't want to allow them to "submit" the survey unless they've answered every question, right? So we need a different way to determine if they answered all of the questions. I would lean toward using embedded data, BUT that would use a branch condition and that won't allow the back button.
So, I tested - I just used an ending block. In the block I have two questions - 1 that says thanks for finishing, and another that says they haven't finished, please go back and finish. I used display logic on the first one to only show if they have left none of the questions empty.
"if not empty"
the "question" simply says thanks for filling out the survey. BTW, you can also use this if you are using multiple choice, matrix, or any other type of question.
The second question - displays only if the first question doesn't display (in other words, they didn't answer each question).
Using a tiny bit of Javascrip (thanks ahmedA ) for the question where it says, they need to go back, the Submit button will be grayed out.
this.disableNextButton()
I put it under the "on Ready" function
Qualtrics.SurveyEngine.addOnReady(function()
{ this.disableNextButton()
});

https://community.qualtrics.com/XMcommunity/discussion/comment/38904#Comment_38904Hi Matthew,
Thank you for recommending the Table of Contents feature. It's a really good feature for respondents to freely navigate through a long survey.

https://community.qualtrics.com/XMcommunity/discussion/comment/38907#Comment_38907This is a very good idea. Thank you so much. But I have too many questions in my survey which means I need to add tons of conditions in the survey flow. If possible, I will put all questions on the same page or two pages. In this way, the respondents can navigate through the questions by scrolling up and down. And I can still set up required questions as the force to response.

Hello everyone,
I've been reading this thread, as this is exactly the issue I'm facing at the moment.
My survey is pretty large, as it is used as an application form, and I have 19 blocks. The ToC is great, because applicants are able to move back and forth in the form as they wish. However, I do require them to complete all fields that apply to them. By adding force response requirements to each question, an applicant is not able to move freely around the sections anymore. By removing the force response requirement, an applicant can complete some parts of a question, and move on and is able to submit the application, even though the questions are not answered completely, and the ToC feature does not pick this up in the end.
Has anyone been able to find a solution for this without adding 27 million different logics?
Katja

KatjaT Sorry, I didn't know about this scenario. ToC sounds great (for allowing the user to jump around in the survey), but yeah, if you make them required response...if that breaks the ability to use the ToC that seems to be an oversight/bug. Have you checked with support? If you get the, "it's intended functionality" answer, they'll probably suggest you create a Product Idea post. Let me know and I'll upvote it as this sounds like a great way to help with the survey process.