As of Gravity Forms 2.4, this functionality is part of the Form Editor and the hook has been deprecated.
Description
This filter is used to enable the inclusion of the hidden choice in the Field Label Visibility and Sub-Label Placement settings on the field Appearance tab in the form editor.
Please bear in mind that hiding the field label will impact the accessibility of your form for users with visual impairments.
Usage
add_filter( 'gform_enable_field_label_visibility_settings', '__return_true' );
Parameters
This hook has no parameters.
Placement
This code should be placed in the functions.php file of your active theme.
Source Code
This filter is located in GFFormDetail::forms_page() in form_detail.php