How to disable tab key navigation in form fields.

Could you please explain further what you need? Do you want to add tabs in your form? This is possible with the Form Tabs widget: https://widgets.jotform.com/widget/form_tabs 

Follow this guide to add it in your form: https://www.jotform.com/help/252-How-to-Add-a-Widget-to-Your-Form 

Let us know if you need more help.

We have had several customers saying they used tab and it closed their form or did not save their input when they moved to the next field using tab.
Using tab is not an unusual way to move from field to field as I do it myself and have seen settings in software to turn this in and off.
Thank you so much for your help!
LisaYanda@outlook.com
325-650-7559
...

Unfortunately, we don't have a feature to disable tab navigation. What you could do is to require the fields: https://www.jotform.com/help/546-How-to-Set-a-Field-as-Required-or-Non-Required 

As well, you can enable the auto-fill feature, so the data is stored in the browser's local storage, so if the close the window, they can come back to the same browser and see their information: https://www.jotform.com/help/227-How-to-Enable-Auto-Fill-on-Forms 

Thanks for the information.
LisaYanda@outlook.com
325-650-7559
...