Web Bluetooth isn't available in this browser (needs Chrome/Edge on desktop or Android, over HTTPS or localhost). Use MQTT mode instead, or switch browsers.
Both panels power off during this window to avoid lighting up a room overnight. Set the same time for both to keep the screens on all the time.
Device settings (name, WiFi, MQTT server, topic) are read/written over Bluetooth only — switch to Bluetooth mode and connect to the device to change them.