Right now in forms and documents when i switch to list view i am able to see Size Column and it is empty. The Business dont want it .How to customize the List view. As the column is empty and we are ot getting size of an adaptive form. We need to remove it . Or is there any way to add size to adaptive form.
The columns in Assets console are governed by . To hide the Size column change the property 'default' to 'false' at 
Seems working for me
Please confirm if we are talking about the same console, Assets List view in AEM or you are using some other console in AEM Forms
That path was for Assets only.  is the path for Forms&Documents. Add property sling:hideResource and set its value to (String) true to hide it from the Forms&Documents console