I have been told it is possible to switch from a non immigrant B visa to a tourist visa. So let's say you leave your job, work permit cancelled and school says you need to leave the country in 5 days, you can go to immigration and stay for 30 days as a tourist. Anyone done this or can confirm?
TLDR : Answer Summary
The post discusses the possibility of switching from a non-immigrant B visa to a tourist visa in Thailand after leaving a job and receiving a cancellation of the work permit. The community comments clarify that this is not possible; one can only obtain a tourist status upon entry into Thailand, not while already in the country with a different visa.