Selection disables the display of manipulators.
Translation activates the Translation tool.
Rotation activates the Rotation tool.
Scaling activates the Scaling tool.
Camera Tool Icons
Set Bookmark saves the camera viewpoint for the current session.
Show Bookmark restores previously saved camera viewpoint.
Focus moves the camera viewpoint to focus on selected objects (Shortcut: F).
Align aligns the camera direction with the normal of a user-defined triangle.
Reset sets the camera viewpoint to its default.
Set Pivot sets the rotation center of the orbit camera controller.
Axis toggles the display of the axis indicator in the viewport.
Grid toggles the display of the grid in the viewport.
Fullscreen changes the display mode from window to fullscreen (Shortcut: F9).
Skybox toggles the display of the skybox (distant background).
Lighting toggles the lighting mode.