Delete individual elements
In addition to deleting whole features, you can delete some of the individual elements that compose the features, such as lakes and small islands. This option is not available for point maps.
Elements. Click the elements that you want to delete. If you want to delete multiple elements simultaneously, Ctrl-click the additional elements. (On macOS, use Command-click.) Note that the elements will also be selected in the map preview. You can click and Ctrl-click (Command-click on Mac OS) the elements directly in the map preview in addition to selecting them from the list. Because the list of element names is not descriptive (each element is assigned a number within the feature), you should check the selection in the map preview to ensure you have selected the elements you want.