To control the display of custom properties and attributes for block references on the Quick Properties panel
- Click Tools
tab
Customization
panel User
Interface. 
At the command prompt,
enter cui. - In
the Customize User Interface Editor, Customize tab, in the Customizations
In <file name> pane, select
Quick Properties.
- In
the Objects pane, select Block Reference from the Object Type list.
- In
the Properties pane, select the check box next to Custom and Attributes.
If the Custom category is checked, the dynamic properties for a block are displayed on the Quick Properties panel. If the Attributes category is checked, the attributes for a block are displayed on the Quick Properties panel
- Click Apply.