The Section View is the status of the display (in the View window) when only part of the transport domain is displayed (i.e., only one or few, but not all, Sections are displayed). The parts that are not displayed are still visible in the background (gray thin lines and/or surfaces), but are inactive and cannot be selected for various operations. The Section View can be cancelled (and the entire domain displayed) using the menu command Cancel Section View or the popup menu command Display Whole Domain.