LG DLGX3901B.ABLEEUS Owner's Manual page 43

OPERATION 43
Damp Dry Signal
When this option is selected, the appliance signals
when the load is approximately 80% dry. This
allows you to remove faster-drying lightweight
items or items that you would like to iron or hang
while they are still slightly damp.
Press the Damp Dry Signal button before you
start a drying cycle.