General program options, such as cursor shape, axis color, zoom factor, and display of coordinate system icons.

Coordinate system icon:

You can choose to display the User CS and/or World CS symbol/s.

For both, you can set the color of the axes and size of the icon. 

For the World CS, select the corner of the screen where it will be displayed: TopLeft, TopRight, BottomLeft, BottomRight

Drawing cursor

Cursor Shape: Select one of the three shapes provided.

Show crosshairs: Overrides the normal cursor, displaying a screenwide horizontal and vertical line intersecting at the cursor position.

Show Isometric: Overrides the normal cursor, displaying all three axes.

Show Snap Aperture: Displays a circular area around the cursor whose radius is the Aperture Size. Aperture is used while snapping, to detect objects.

Aperture size: Specify the radius of the aperture in pixels.

Advanced Settings

Nudge Step: Sets the distance that a nudge will move an object. Values are specified in Pixels.

Zoom factor: Controls how much you zoom in or out of the drawing when you use View / Zoom In or Zoom Out. The default zoom step setting is 2, meaning that zooming in doubles the size. See Zoom In and Zoom Out.

Zoom In/Out Centralize: When this feature is On (default), rolling the mouse wheel will zoom in/out and centralize the view & cursor at the center of the drawing area. When this is Off, rolling the wheel will zoom in/out at the location of the cursor.

Fixed relative origin: If checked, the relative origin will be fixed while in relative or polar coordinates. If you need to relocate the origin, it must be done manually. See Relative Coordinates and Polar Coordinates.

Geometric select edit: If checked, objects will be selected by their geometric extents, rather than their cosmetic extents. This permits geometrically accurate scaling of objects like double lines and lines that have nonzero width. See Geometric and Cosmetic Select Modes?.

Apply general property changes to all tools presets: Enables the Property toolbar to change all styles for all tools.

Undo/Redo

Undo/Redo depth: Sets the number of operations stored in the Undo buffer.

Include Model / Paper space switch in Undo buffer: If checked, switching between Model and Paper spaces will be included in the Undo buffer.

Selection

Use Choice if several entities in aperture while selection: If more than one object lies within the aperture area during a selection, a small window appears from which you can select the desired object.

Visual Effect Settings: Settings for the various "highlighting" methods. See Selection Visual Effects Settings.

3D Boolean operations

Transfer material from operand on its facet: When checked, material from one object is transferred onto the other during a 3D boolean operation (3D add, 3D subtract, etc.). When unchecked, the materials are not affected on either object.