Where can I extend my 90-day visa waiver stay in Thailand with the COVID extension?

To extend your 90-day visa waiver stay in Thailand due to COVID, you should visit the immigration office located at IT Square Plaza Laksi on the 3rd floor if you are in Bangkok. Make sure to check what documents you need to bring with you. It's also wise to have a contingency plan in case your extension request is denied, as approvals are at the discretion of the immigration officer.