When I open Unity I get a grey screen.
Do you have any ideas to solve this?
If you use only UI like me, the problem is that your canvas(es) are not attached to the camera, so :
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Select your canva (or all of them if you have many)
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In the inspector : Render mode → choose “Screen Space Camera”
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Drag and drop your camera (from the hierarchy) into the “Render Camera” Case (in the inspector)
It’s something that should be automatically fixed, but no… Have fun