How to get my basic UE full screen display back I can't find my normal display in modeling mode of my model anymore

Hello
I had several amazing days. I imported my Twinmotion project into UE 5.4 1st person game mode
and started adding emisive lights etc . I have a VIVE VR helmet today I wanted to try to “walk around” my model with STEAM . But something did not connect so I gave up
Then I clicked on PLAY and it displayed my model but NEXT to the oringinal square play ground where I had left one of the blue cubes. I never asked for a gun but it was there floating around.
Each time I walked towards my model I fall off the square.
ALSO I can’t get out of the PLAY mode anymore even if I click stop somehow by accident I clicked on one of the menus and it took over the entire screen .
I restarted the PC and UE etc and it always opens in the PLAY mode and the menu taking over the entire screen. Is there a setting just to return to the basic display I can’t find out how to make the menu go back to the right side of the page
I made many nice screen shots of my project and when I open UE it shows the thumbnail of my project. This is soooo frustrating …I am sure it’s just something basic in the UI I just don’t know

Also I can’t find the right plugin for VIVE for STEAM VR for UE
unless on a VALVE website by UNITY I don’t know if that is right?

I know thats a lot of asking questions but I am stuck infront of dark screen
and it says “NO ACTIVE MODE” and when I go to MODELING etc nothing shows
I don’t know what that is …