The Surface List on the Feature Slide-out Panel shows a list of all of the surfaces that are referenced by the feature. When you click on an item in the list, the corresponding surface is highlighted on the CAD model. You can click on the Edit/Redefine button if you want to launch the Edit/Redefine Feature window to redefine the feature references or if you want to add surfaces to or remove surfaces from a multi-surface feature. See Edit/Redefine Feature for more information.