Do I need to leave Thailand to renew my language visa, or can I do it while staying in the country?

The question revolves around the renewal process for a language visa, which is likely referring to an Education (ED) visa. While some users suggest that it may be possible to extend a single-entry ED visa from within Thailand if requirements are met, others indicate that multiple-entry visa holders may need to leave Thailand and re-enter to renew their visa. There are also warnings about ongoing investigations related to in-country ED visa issuance, emphasizing the importance of maintaining legitimate enrollment in a school.