Hi Abdul Zameer,
I understand what issue you are facing; you just follow the below steps your problem will be solved,
*First Page, you will have next button in that onclick create a microflow, in that keep show page activity there you should kept 2nd page and pass appropriate parameter.
*Follow above step for 2nd page next button too.
*For previous button create a microflow and kept show page activity to show previous page there you need to pass appropriate parameter follow this step for page 2 and 3 previous buttons.
*In the final third page create a button for save, give onclick action as save changes.
Hi, there is a wizard example in the learning paths: https://academy.mendix.com/link/modules/184/lectures/1434/4.3-The-Wizard-Page-Template
they pass the request entity parameter trough the pages. (properties->data→ parameter your entity)