#Slack https://slack.com/intl/ja-jp/help/articles/360039953113-%E3%83%A1%E3%83%83%E3%82%BB%E3%83%BC%E3%82%B8%E3%81%AE%E6%9B%B8%E5%BC%8F%E8%A8%AD%E5%AE%9A%E3%82%92%E8%A1%8C%E3%81%86 `Preferences` -> `Advanced` -> `Format messages with markup`