When you are finished adding elements to your dynamic block definition in the Block Editor, save the block definition.
In the Block Editor, you can save your block definition by clicking the Save Block button on the Block Editor contextual tab, or by entering bsave at the Command prompt. You should then save your drawing to make sure that the block definition is saved in the drawing.
When you save a block definition in the Block Editor, the current values of the geometry and parameters in the block are set as the default values for the block reference. When you create a dynamic block that uses visibility states, the default visibility state for the block reference is the visibility state at the top of the list in the Manage Visibility States dialog box.
Once you've saved the block definition, you can close the Block Editor and try your block in a drawing.