Hello
Sorry it’s a basic one 
when I’m in the camera view the scene disappears (inside the green zone) I tried things but with no success 
it sure looks like the camera clipping end is too close, but that back wall doesn’t look like it’s 100 meters away.
Is everything modeled to scale?
Does changing the camera clip end change anything?
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That kind of looks like a Holdout Matte. Try right-clicking on that collection > View Layer and see if you have the option to Clear Holdout or Clear Indirect Only.
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you’re right, works fine now in camera view 
still a bit weird in tne viewport (outside camera view), but I can work now 
I had only glanced at your first picture and had overlooked that the values are displayed in cm,
Therefore, I thought 10000 should be enough, when I opened the scene then everything was clear
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