I don’t think you can with that charger … although the one I had nearly caused the house to burn down so I wouldn’t use one for anything let alone discharging which generates heat.
EDIT: Just stumbled across this in another thread so seems it can be set to a lower termination / storage charge of 3.7v but I’m guessing that’s for charging from empty … don’t know if the same can be set for termination on discharge
Still wouldn’t ever use one though!