This tab on Permission Matrix form contains a list with options to set permissions. The list has three categories: Data Objects, Forms and Views. All entities that belong to these categories are listed under respective category. You need to expand the row to see the entities under it.
Each entity listed has four permission options: Create, Edit, Delete and Import. All these options have an image icon having two states: Enable and Disable. By enabling the permission means user assigned to the role has right to perform the respective action and is able to see the related option on Entity Editor and Views Form. If not enabled, the options won’t be available to the user. Import option is only applicable for the Data Objects category.
When you have completed setting up the permission in this form, you save the changes using Save button.