This window contains various settings for customizing Viewport controls.
To open it, select Input settings from the Settings menu:
The mouse button used for selecting objects in the Viewport.
The modifier key for selecting multiple objects.
Select reverse hierarchy modifier
The key used for selecting reverse hierarchy (i.e. selecting every parent of the object).
The keys used for rotating the camera.
Applies to both the Viewport camera and Camera objects.
The keys used for translating the camera.
The keys used for zooming the camera in and out.
Manipulator pull from anywhere
Keys and mouse buttons for operating the selected part of the Manipulator.
Manipulator radius change
Keys and mouse buttons for scaling the Manipulators.
The mouse button used for setting the pivot point.
The next three options define Viewport controls:
Keys and mouse buttons for controlling Viewport rotation.
Keys and mouse buttons for controlling Viewport panning.
Keys and mouse buttons for controlling Viewport zooming.
Reset to defaults
Restores every parameter to their default value.
Sets the Viewport controls to a scheme similar to the one in Blender.
If you are using macOS, be sure to set the Visor translation setting to Right Mouse + Shift + Alt.
Otherwise, you won't be able to control camera in the scene (this applies to Viewport camera and Camera Objects alike).