How to remove skybox?

hi, everyone.
this is the first time i post a question in unity forum. i want to asking you all that have more experience. my problem i want to remove skybox, not using gradient or something. i’ve tried to change camera clear flags to depth only and don’t clear. it works like what i want but when the camera move , the rendered image still leave there.

this is the first apperance

and this is right afer i try to move the camera closer

thanks for your reply and suggestion guys.

and set the skybox to ‘none’.

Window–> Lighting → Environment Reflections → Source = Custom Cubemap = None

Now is inside Window > Rendering > Lighting.