On the walls and partitions you will see a QR code. It is written entirely in Thai and in size 8 font. But I can read it and it said 'review the officer'.
I spent 6 hours waiting at 3 desks while two of the desks had no one behind them, the air con for the entire building has been turned off, and the car park is now a scrap yard. So no wonder they clearly don't want foreigners to be able to read it.