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The 3D Viewport is used to interact with the 3D scene for a variety of purposes, such as modeling, animating, texture painting, etc.

Header Region

The header contains various menus and controls based on the current mode.

Tools and modes in the 3D Viewport header are split in three groups of buttons:

Mode: The 3D Viewport has several modes used for editing different kinds of data.
View: This menu offers tools to navigate in 3D space.

Other menus depend on the current mode, Object Mode menus listed below:

Select: Contains tools for selecting objects.
Add: Gives a list of different objects types that can be added to a scene.
Object: This menu appears when in Object Mode. it contains tools to edit objects. In Edit Mode, it will change to the appropriate menu with editing tools.

Transform Orientations

Use to select and modify the active Transform Orientations.

Pivot Point

Used to change the reference point (or Pivot Point) used by many mesh manipulation tools.

Object Type Visibility: Change the Object Type Visibility and selectability of objects in the 3D Viewport.
Viewport Gizmos: Change the way how gizmos are displayed in the 3D Viewport.
Viewport Overlays: Change the way how overlays are displayed in the 3D Viewport.
X-Ray: Show the whole scene transparent. This is a shortcut to the X-ray option inside the shading control.
Viewport Shading: Change the shading of the 3D Viewport.