the capsule of my camera and interactive window

Hello, I have 2 questions that I want to resolve in my scene. The first is about my first-person camera capsule. I want the view to be at the height of a person and when I put it like that, the height of the capsule collides with the height of a doorway. What can I do so that the height of the capsule does not collide?
The second question is that I want to know what I have to do so that in my scene when I click on an object a window appears as if it were a tab of the object’s characteristics and then I can close the window. If you can help me, I would appreciate it, thanks.

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