Multi-output, multi-class

Select an output and the class id selector will appear.

Multi-output

Both outputs are not multiclass. If only one of them is selected, the no class id will be automaticalyl selected and the class id selector will not be visible. If both outputs are selected, the class id selector will become visible.

Multi-class

Since there is only one output, it should be selected automatically and we should see the class selector by default.

Single-output

Since there is only one output and no class, both should be selected automatically.