Opens the block definition in the Block Editor.
Button
Ribbon: Home tab 
Block
panel Block
EditorNot available on the ribbon
in the current workspace. Toolbar: Standard
Menu: ToolsBlock
EditorNot available in menus
in the current workspace.The Edit Block Definition dialog box is displayed. Select a block definition to edit or enter a name for a new block definition to create, then click OK to open the Block Editor. If the ribbon is active, the Block Editor ribbon contextual tab is displayed. Otherwise, the Block Editor toolbar is displayed.
When the BLOCKEDITLOCK system variable is set to 1, the Block Editor cannot be opened.
The Block Editor is a separate environment for creating and changing block definitions for the current drawing. You can also use it to add dynamic behavior to blocks.
Select from a list of block definitions that are saved in the drawing to edit in the Block Editor. You can also enter a name for a new block definition to create in the Block Editor.
The Block Editor contains a special authoring area in which you can draw and edit geometry as you would in the drawing area.
