is possible? It is mostly in the way for me.
Well, unclick it ! 
unclick what?
Ye there’s no option that I know to disable the cam view, if you select a cam you will have that small popup on your viewport… it would be nice to have the option to disable it.
Same thing also for the Lightmap display: if you have the lightmap options window open, this will show up… and for me that I have found a nice place to put it and have it always open it’s kind of boring… but I got used to it.
Some other times instead I’d need to see a cam view without having it selected and I can’t. I guess they will add this feature in future.
unclick the main camera from the sample scene
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in the gizmos (scene) : uncheck the box ‘camera’
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That is useful to know, although unfortunately it also minimises the Camera component in the Inspector. I wish they were not linked.
Why not just minimising the camera component in the inspector when the preview is in the way? And put it back from the gizmos menu when you need it.
Because I do use the camera component, but have never had a use for the preview.
The Main Camera preview in the Scene window is only visible if the Main Camera component is selected in the Hierarchy. if you deselect it in the Hierarchy, then it will disappear.
Unity 2021.2+ uses a new overlay system which is also used for the camera preview.
By right-clicking on the title bar you can now choose to collapse the preview:
Completely hiding the panel is still not an option, but this should be close enough 
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In unity 2023, there is now an overlay setting in the scene view context menu.
You can disable the preview there.
Click the three dots to the top right of the scene view (on top of the gizmo) and click overlay menu.
Camera will show up there
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Yup, also exists in 2022.3 LTS.