The viewport, construction script, and event graph tabs won't show up. How do i fix it?

When I opened the Sidescroller GameMode blueprint, none of the tabs showed up. The event graph, viewport, and construction script tabs that are normally there when I open up a blueprint were completely missing. I don’t know if it was something I did, or something that it did on its own. I just need to know how to add them in. Also, telling me where I messed up would be appreciated.

at the top there is a windows tab just put a check next to view port and a check next to my blue print now go to my blueprint right click on graph and open and under functions construction script same way and save it should all be set back