The Scene view control bar lets you choose various options for viewing the Scene and also control whether lighting and audio are enabled. These controls only affect the Scene view during development and have no effect on the built game.
The first drop-down menu selects which Draw Mode will be used to depict the Scene. The available options are:
These modes let you view each of the elements of the G-buffer (Albedo, Specular, Smoothness and Normal) in isolation. See documentation on Deferred Shading for more information.
The following modes are available to help visualise aspects of the Global Illumination system: UV Charts, Systems, Albedo, Emissive, Irradiance, Directionality, Baked, Clustering and Lit Clustering. See documentation on GI Visualisations for information about each of these modes.
There are two Material Validator modes: Albedo and Metal Specular. These allow you to check whether your physically-based materials use values within the recommended ranges. See Physically Based Material Validator for more information.
To the right of the Render Mode menu are three buttons that switch certain Scene view options on or off:
The menu (activated by the small mountain icon to the right of the Audio button) has options to enable or disable rendering effects in the Scene view.
The Effects button itself acts as a switch that enables or disables all the effects at once.
The Scene visibility switch toggles Scene visibility for GameObjects on and off. When it’s on, Unity applies the Scene visibility settings. When it’s off, Unity ignores them. This switch also displays the number of hidden GameObjects in the Scene.
For more information, see the documentation on Scene Visibility.
The Component Editor Tools panel switch toggles a toolbar for custom commands that affect the current selection. The toolbar appears in a window inside the main Scene view window.
For more information see the documentation on Using Custom Editor Tools.
The Camera settings menu contains options for configuring the Scene view camera. For more information, see the documentation on Camera settings.
The Gizmos menu contains lots of options for how objects, icons, and gizmos are displayed. This menu is available in both the Scene view and the Game view. See documentation on the Gizmos Menu manual page for more information.
The rightmost item on the control bar is a search box that lets you filter items in the Scene view by their names and/or types (you can select which with the small menu at the left of the search box). The set of items that match the search filter are also shown in the Hierarchy view which, by default, is located to the left of the Scene view.