From the View Menu, select Shape Viewer to bring up a dialog displaying a list of all drawn items for the current sheet.
Items at the top of the list are drawn on top of other items below it.
The buttons can be used to move the shapes' position in the list: they are "move to top", "move up", "move down", "move to bottom".
There is also buttons for changing to the next/previous sheet, and a drop-down menu for quickly jumping to any sheet.
A list of each drawn item is shown, as well as its thickness and colour (may be an RGB value) attributes. Additional properties are displayed,
for example a text entry will display its text.
Buttons are enabled/disabled as appropriate - for example, selecting the shape at the bottom of the list disables the "move to bottom" and "move down" buttons, since they cannot be moved down any further.
The shape viewer is also synchronised with operations on the canvas. When you draw, undo, redo, edit a shape, change sheet, add/close a sheet, the viewer is updated.