What I was trying to find out
@Fi***
is the type of stamp you were on BEFORE you got the covid extension and what you did to get the covid extension <- that's what that matters.
IF you were on an ED visa extension that you cancelled and then went on a covid extension you MIGHT <- as in may be able to go to an in country 90 day Non-B visa based on employment.
You would need at minimum 15 days left on your current covid extension to apply AND your employer would need to meet the in country requirements to get that visa issued at the immigration office in your area.
GO to the immigration office and get the hand out listing the requirements to get the in country Non-B issued (it is much more stringent than getting a Non-B issued from a thai consulate in another country).