In some situations, we may wish to define objects manually. For example, we may wish to provide very specific local areas for regression modeling or we wish to export mean spectra of specific regions that do not separate using our pixel classifier. This is possile using the Additional object separation tool: 

By setting the Manual option, we may define object separation by drawing background labels in the object segmentation result.In our example, we may force separation of the leaf from the nut even when we use the All foreground mode or separate the nut object into two parts (for example, to extract mean spectra from both).

Note, that the manual object separation does not extend to runtime. It is intended for specific highly controlled extraction of data, not for automatic application to new images.

Holding shift, we may remove the separation labels. Clearing separation labels entirely is possible via the context menu: