How do I center the Next Button when the Back button is hidden

Please see screenshot. Pretty self-explanatory

I have cloned one of your forms and Injected this Custom CSS to the form:

#cid_25 div.form-pagebreak-next-container {

  float: none !important;

  margin: auto !important;

}

Depending on which form you apply it to, the CSS code should change slightly, specifically the ID selector (#cid_25).

To find the ID of your page break buttons, follow this guide:
How to Find Field IDs and Names

Follow this guide to see how to Inject Custom CSS to your form:
How to Inject Custom CSS Codes

Form DEMO: https://form.jotform.com/80285622179966

Let us know if you need further help.