My world is upside down by accident, I can't see it anymore since I tried put a light

UR 5.02

Hello I treid to build a simple factory floor with a garden
FACTORY_found_UPSIDE_down.umap (544.7 KB)

In the beginning it all looked ok
I reduced the floor 400-400 to 0,75 so they should be 300 x300
then took one floor and ctrl ALT copie it again and again till
I had a square.
I could not find where to resize it per cm per say?
I tried the snapping ( for angles it works well)
but for floor or wall parts I tried it at 1 , 0.25 , 10, 100 I never felt is really snapping
so I tried my best to place it by view .
Then I place some grass and moss in the garden a rock and a few imported
volumes
THAN came the big problem. I think I tried adding a light
and then tried to “bake the scene” ( I admit that was daring)
It’s like I want to see something rendered on my first day.
All went hey wire the world ended upside down the grid it on top
the sky is under and I can’t turn both to the horizontal
I’s like a canoe with air but the sky came down with it…
Anywone can see somehting ?
I tried the same today again and then reached a stage where
I could not rename groups of meshes…very frustrating also

You can always instantly see something rendered (at lower lighting quality) by setting all lights to movable. Baking is for high quality and is also a complex or confusing method to begin with.

Thank you. Would be nice to find out WHERE and HOW to reach the transform menu they show at

This what I see.
This is the very long and very complicated tutorial I try to follow
(35) Unreal Engine 5 Beginner Tutorial - UE5 Starter Course 2022 - YouTube