If you've used any of the features that come with VisualAge, you've selected the Load/Unload Features menu choice available from the Options menu of the VisualAge Organizer (or the Tools menu of the System Transcript) to load the features.
You can also unload a feature from an image. Select Load/Unload Features to open the features selection dialog. From the Loaded features list, select the feature(s) you want to unload, then select << and OK.