Sometimes you simply want to lock access to Gravity Forms to only logged in Administrators. This function will allow you to hide the Gravity Forms menus and sub-menus for every logged in user except Admins.

// Only show Gravity Forms menus to Administrators

function hide_gravity_forms_menus() {
    if( !current_user_can( 'manage_options' ) ) {
        remove_menu_page( 'gf_edit_forms' ); // Gravity Forms Main Menu
			remove_submenu_page( 'gf_edit_forms', 'gf_edit_forms' ); // GF Forms List View
        	remove_submenu_page( 'gf_edit_forms', 'gf_new_form' ); // GF Forms Add New
        	remove_submenu_page( 'gf_edit_forms', 'gf_new_formf_help' ); // GF Forms New Form Helper
        	remove_submenu_page( 'gf_edit_forms', 'gf_entries' ); // GF Form Entries
        	remove_submenu_page( 'gf_edit_forms', 'gf_settings' ); // GF Forms Settings
        	remove_submenu_page( 'gf_edit_forms', 'gf_export' ); // GF Forms Export
        	remove_submenu_page( 'gf_edit_forms', 'gf_update' ); // GF Forms Update
        	remove_submenu_page( 'gf_edit_forms', 'gf_addons' ); // GF Forms Addons
        	remove_submenu_page( 'gf_edit_forms', 'gf_help' ); // GF Forms Help
    }
}
add_action( 'admin_menu', 'hide_gravity_forms_menus', 9999 );