After a while, I moved to the dining room for surveillance, it went better there, I also felt better and was not so nervous. I checked the lunch cards and corrected the "operation" of the pupils in the canteen so that unnecessarily long rows would not form (both when dispensing and when handing over the trays with leftover food).
After a while, I moved to the dining room for surveillance, it went better there, I also felt better and was not so nervous.