What is the process for obtaining a fourth extension of a non-O retirement visa in Thailand?

I got the fourth extension of my non-O retirement visa at CW yesterday, with appointment. 1. Covid checkpoint at the front door. Fill out a form, put that you’re not at high risk. Show your vaccination certificate. They were set up to give tests, but I didn’t see them testing anybody. 2. Bank letter at Krungsri, uneventful. 3. Went directly to counter 32, as directed on the appointment. They were using queue numbers, I have not stopped at the front desk to get one, but they saw me anyway. 4. I had condo contract, copy of landlords ID, passport, TM 30, TM6, 90 day report, bank letter, copy of all pages of bank books, and drawn map, paper about overstay, and they had me fill out one more paper, some kind of declaration, with the same information as on the TM 47. Immigration worker at that desk stamped everything. She handed me the packet, and directed me to the officer at the back desk at the next cubicle. That lady had it approved in about 10 minutes. In total, arrived at 8 AM, got bank letter, copies made, and saw immigration, out at 11 AM. I had filled out all the forms at home, and I already had a picture.