Hello, @Anpu,
No, this is not how the tabs work. Let me try to explain it to you.
Usually, tabs are used to show specific content just like the FAQs, we add for the users to check the specific content, the user wants by switching the tabs as per the user want.
Tabs have no such feature/functionality like this that adds a step process form in it and by just filling the form and clicking on next the other tab will auto open.
No, It’s not possible in the tabs widgets. It requires extra customization also, there are other third-party plugins available for this kind of feature for forms you can try to find the one which suits your requirements and use it at your own risk.
Regards 8Themes Team.