When an object is fully constrained, all relevant geometric and dimensional constraints are applied to the geometry.
You should always fully constrain geometry in a dynamic block definition that contains constraints. If a block definition is not fully constrained, you may get unpredictable behavior when the block is inserted in a drawing. For more information on fully constrained objects, see
Work with Fully Constrained Block Definitions
BCONSTATUSMODE system variable allows you to switch between the constrained status modes. You can also use the ribbon to switch between modes while in the Block Editor.
You can identify fully constrained objects with the constrained status mode in the Block Editor. TheBlock Editor Settings dialog box.
The constrained geometry is represented with different colors. For more information see the