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You must be using the Data Miner Classic UI (not Data Miner Workflow).
Data Miner Classic utilizes a Mining Activity to build and test models.
In the case of a Classification Mining Activity, you specify the build and test specifications.
The specific target value is for use in the Lift and ROC test result calculations.
In Data Miner Workflow the topn(100 or so, I forget the current setting) distinct target values have their lift results generated.