Once an underlay is imported, select the entire underlay by doing one of the following:
- click on the underlay's border, or on any portion of the underlay that is not a raster image
- window-select the entire underlay, or any portion of the underlay using a top-right-to-bottom-left (crossing window) selection method
You can select individual objects that are placed on top of the underlay by clicking directly on those objects.