Any ideas why VISIBLE below is causing an issue?

CREATE TABLE IF NOT EXISTS `setting` (
  `uuid` INT(10) NOT NULL,
  `type` VARCHAR(255) NOT NULL,
  `code` VARCHAR(255) NOT NULL COMMENT 'An unique name.',
  `value` MEDIUMTEXT NULL DEFAULT NULL,
  `comment` LONGTEXT NULL DEFAULT NULL,
  `created_on` INT UNSIGNED NOT NULL,
  `updated_on` INT UNSIGNED NOT NULL,
  PRIMARY KEY (`uuid`))
ENGINE = MyISAM
DEFAULT CHARACTER SET = utf8;

CREATE UNIQUE INDEX `name_UNIQUE` ON `setting` (`code` ASC) VISIBLE;

CREATE UNIQUE INDEX `uuid_UNIQUE` ON `setting` (`uuid` ASC) VISIBLE;

Errors:

CREATE UNIQUE INDEX name_UNIQUE ON setting (code ASC) VISIBLE Error in query (1064): Syntax error near 'VISIBLE' at line 1

CREATE UNIQUE INDEX uuid_UNIQUE ON setting (uuid ASC) VISIBLE Error in query (1064): Syntax error near 'VISIBLE' at line 1

No error if I remove VISIBLE but MySQL Workbench 8.0.12 auto generates that. How can I stop MySQL Workbench from doing that?

My MySQL info in my Ubuntu 18.04:

MySQL version: 5.7.23-0ubuntu0.18.04.1 through PHP extension MySQLi