Edit Entity dialog box allows you to configure exposed entities - select fields to expose via OData API, specify names for OData entities and entity sets, etc.
The upper part of the editor contains the following boxes:
Name - here you can specify the name of the entity.
Source - here you can specify the data source table to expose data from via this entity.
Entity Set - here you can specify the name of the entity set.
The bottom part contains the list of the fields. This grid also displays field data types, and whether fields are nullable. Here you can also select fields to expose or to hide.
By default, all fields are available via the OData API. To hide fields, select them in the grid, using Ctrl or Shift keys and click the Hide selected button above the grid. To expose hidden fields again, select the fields using Ctrl or Shift keys and click the Show selected button above the grid.
Hidden fields are displayed dimmed.