How do I make certain questions mandatory?

I would like to make certain questions mandatory. As in, they can't submit the form or continue unless the questions are completed.

Please note that you can make a field mandatory by right clicking on it and then selecting the "Require" option, which would then make the field required, as in the form won't submit without the user filling this field.

I have created an example screenshot to show you the menu that shows up when you right click on a field, with the require option in:

If you need our assistance with a specific field, please provide us with the form ID or URL and point us to the field in question, and we will assist you ASAP.

I hope this helps. If you need further assistance please let us know. Thank you.