Settings > Display > Function Key for the Idle State (Sleep)

Function Key for the Idle State (Sleep)
If you press the key you switch the idle state on immediately.
If the power save mode is enabled, it will be switched on together with the idle state ( > Settings > Device > Display > More > Power save mode behaviour).
As the function key LEDs are switched off in power save mode, you cannot use them to tell you which status the functions currently have.
Proceed as follows by assigning the function key:
The function can only be assigned to a programmable function key that has an LED (not on a touch function key).
For further information about the general procedures when assigning function keys, see Function Keys.

COMfortel 1400 IP/2600 IP/3600 IP - Firmware V2.8 - Advanced Information V08 12/2020