A Salesforce associate is looking at a custom Contact list view and wants to show...

 Selecting Fields to Display is what the associate should do to add the missing key columns to the custom Contact list view. Selecting Fields to Display is a feature that allows the user to choose which fields to show as columns in the list view, and in what order. The user can select up to 15 fields to display, and drag and drop the fields to rearrange the column order. Editing list filters is a feature that allows the user to apply one or more criteria to filter the records that are displayed in the list view. The user can select a field, an operator, and a value for each filter, and combine multiple filters with AND or OR logic. Editing sharing settings is a feature that allows the user to control the access and visibility of records for different users and groups. The user can define the organization-wide default, role hierarchy, sharing rules, and manual sharing for each object.