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Desk Clock settings
Install app
Go fullscreen + landscape
Close
City for weather (leave empty to hide weather)
Clock format
24-hour
12-hour
Temperature
°C
°F
Show seconds
Yes
No
Night dimming
On
Off
Night starts (hour)
Night ends (hour)
Save
Screen always on: turn on Android
Developer options → Stay awake
and keep the phone charging. The clock moves a few pixels each minute so the screen doesn't burn in.