Waters ACQUITY UPLC Operator's, Overview And Maintenance Manual page 45

You can access additional functions by right-clicking anywhere in the detector
control panel.
Additional functions in the detector control panel
Control panel function
Autozero
Reset PDA or
Reset eλPDA
Help
Description
Resets the detector offsets.
Resets the detector, when present,
after an error condition.
Displays the console Help.
Starting the detector 33