Adds a new column to control the visibility of an entity. If a visibility column already exists for the entity, the existing column is returned.
 This is only valid for ConfigurationTopTable and ConfigurationCustomThemeTable objects and will fail for all other table types.
"configurationColumns_var" is a variable referencing a ConfigurationColumns object. | 
        
"configurationColumns_var" is a variable referencing a ConfigurationColumns object. | 
        
| Type | Description | 
| ConfigurationVisibilityColumn | Returns the new column or null in the case of failure. | 
| Name | Type | Description | 
| entity | Base | Returns the entity whose visibility will be controlled by this column. |