Scene view: Visibility#

Check that Scene visibility isn't disabled.

Scene view visibility

Visibility can be toggled for an object and its children by clicking the icon. Individual objects can be toggled by holding Alt while clicking.
Toggle an isolated view of an object with the shortcut ShiftH.
Toggle Scene visibility entirely using the eye icon on the Scene view control bar.

Scene view visibility

See Scene visibility for more information.

I still cannot see items in the Scene view.