What should I do about my visa after leaving my job in Thailand while having Thai children?

Des Igning >How and where would this be done?

You'd do it your local immigration office and labor department.

> and what documents would need to be provided?

For what? You'd want to cancel your work permit and extension of stay based on employment using your termination documents. For the 60 day extension of stay based on unable to travel due to COVID-19, you'll need:

1. Your passport and a copy of:

a. Your data page

b. Your most recent entry stamp

c. Your departure card

2. A TM30 on file

3. 2x passport pictures

4. The forms (for Bangkok, they are in this group, for other immigration offices, you'd have to go there)

5. 1,900 THB.

6. A letter from your embassy saying that you can't travel due to COVID-19, OR a screenshot from your embassy website saying they don't issue the letters.

Of course, different immigration offices may have different requirements.

Des Igning you would get letter/documents from your employer saying you are leaving your job on a specific date. You go to the immigration office where your extension was issued and cancel your extension (you may be able to apply for cancellation several days in advance). Then immediately apply for a 60days covid extension at your local immigration office. While you have to cancel your WP at the labor office where it's issued too.

If the answer to those questions is no AND you're doing it before March 30th (the day the ability to get a 60 day covid extension runs out) you would cancel your current extension of stay based on employment and immediately apply for a 60 day covid extension. That would give you 2 months and if you needed more time after that you could also apply for a 60 day visit thai family extension (once) as well.