**Puzzling little problem in unity - light and sky box

Unity A little puzzling problem in
1、 appear Lighting has been disabled in at least one Scene view.Any changes applied to lights inthe Scene will not be updated in these views until Lighting has been enabled again.
Lighting is disabled in at least one scene view . Before you turn lighting back on , Any changes applied to lights in the scene will not be updated in these views .
Suddenly this problem occurs in the scene

Creating a new scene is still the same , Then I can't find the reason . then , It turns out that the light icon has no dot , Crack me up

It may not disappear immediately after clicking , Just click on the light after returning .
2、 Sky box is not displayed in the scene , But there is a skybox in the camera

This is not checked .