Thermostat one switch with unknown functionality

Hi!

I have a TS0601 thermostat. It has 3 switches. I found out that one is boost mode and the other one is child lock-out. I don’t know yet what the third switch does. I haven’t found any certain information on that topic. Maybe it can enable and disable the window heating stop feature? TuYa TS0601_thermostat control via MQTT | Zigbee2MQTT

Another question: The linked docs to the zigbee2mqtt mention setting a schedule in the thermostat but I can’t see how I can do that with ZHA? I would set the schedule in HA anyway but this is just something I noticed.