<?php

/**
 * Remove the column selector for Form #3 in Gravity Forms
 */
add_filter( 'gform_entry_list_columns', function( $table_columns, $form_id ) {

	if( 3 === $form_id ) {
		unset( $table_columns['column_selector'] );
	}

	return $table_columns;
}, 10, 2 );