When set, the top-level cell will be displayed as a schematic, whether or not the top-cell has an active symbolic representation.
Unlike the symbl button in the electrical side menu, this does not change the internal state of the cell (thus triggering the ``modified'' flag), and applies only to the window where set. It is available in electrical sub-windows in physical mode, when the electrical side menu is hidden.
All editing capability is available, so it is possible to edit the schematic and symbolic views of the same cell simultaneously, in different windows.