What is the process for cancelling a DTV visa in Thailand?

Not the exact same situation as I was on O Retirement when I needed it cancelling to leave country for a B to get a WP. I could only have the O cancelled at the issuing office. No idea the DTV process and not seen the process published.

Well first of all if you have all the right documentation there will be no issue at all.

In terms of canceling it yourself should be durable at any Immigration office.

Thirdly, the thing you’re mentioning about Chiang Mai is very correct, they have been interviewing and overseeing documentation. But the wording for the visa goes like this: you need 500k in your account when applying for your visa, there is no requirement to keep that 500k in your account and the other rule that comes into place are Tourist must be able to show 20k bath in instant access or cash to make sure you can sustain yourself while in Thailand.

But for now entering Thailand the smoothest appears to be through BKK airport.

Typically, Immigration doesn’t cancel visas issued by the Ministry of Foreign Affairs. However, DTV is such a long lasting visa. It is an unknown.

Why cancel its good for 5 years??

Vast grey area. Nobody knows for sure. But I would ask the Ministry of foreign affairs, not the immigration office.