Library Mode
It shows the current mode and allows you to exit the mode by clicking OK, Apply, or Cancel.
It is not displayed in Base Mode.

Display Mode(View Option) :Cycling Display Mode by Crtl + D
Auto Edge : Switch to Edge Only Mode for panning and other operations.
Shading + Edge
Shading Only
Edge Only

Selection Tool

• Rectangle
  You can use the rectangular selection tool.

• Circle
  You can use the circular selection tool.

• Polygon
  You can use the polygon selection tool.
  The Cross and Window selection methods of the Selection Tool are determined by the direction of the first line.
  Double-clicking closes the selection area from the starting point to the last point and determines the selection area.

Select
When the button is activated, you can select objects in the view.
When the selection button is active, selecting an object in the view will count the & Option : Switching Selection Options by Crtl + Space
Button and allows you to select objects on the View screen.
When you select objects on the View screen with the Select button active, the number of selected objects is counted.
DoubleInitializes the selected objects when double-clicking the selection button will reset the number of selected objectsSelect button.

1. Select Assigned Library
   When the "Select Assigned Library" button is activated, you can select objects at the library level that are assigned.

2. Select Object Group
   When the "Select Object Group" button is activated, you can select objects at the object group level that are assigned.

Freeze (In)vladate (Alt + Space)
Enabling the button toggles the option to reference frozen objects (when using the Feature, Edit feature) on or off.