You need to change the layout of the page (in the properties). It should be something else than PopUp. I think you want to use the same layout as on your home page. (AtlasDefault?)
Andreas is right. Check out this part of the Mendix documentation:
https://docs.mendix.com/refguide/layout#1-introduction
And check out the learning paths available for starters as they will help you build your first app including all the layout options.