Change maxlength for Caldera Forms text and text input or max for number fields See: https://calderaforms.com/doc/caldera_forms_field_attributes/

caldera_forms_field_attributes-$field-type.php

<?php
/**
 * Set a max length attribute for all paragraph fields in Caldera Forms
 */
add_filter( 'caldera_forms_field_attributes-paragraph', function( $attrs ){
	$attrs[ 'maxlength' ] = 255;
	return $attrs;
});

caldera_forms_field_attributes-conditionals.php

<?php
add_filter( 'caldera_forms_field_attributes', function( $attrs, $field, $form ){
	$type = Caldera_Forms_Field_Util::get_type( $field, $form );
	if( 'text' == $type ){
		$attrs[ 'maxlength' ] = 255;
	}elseif( 'paragraph' == $type ){
		$attrs[  'maxlength' ] = 512;
	}elseif( 'number' == $type ){
		$attrs[ 'max'  ] = 42;
	}

	return $attrs;

}, 10, 3 );