If you have already created a chart, then you will see it in the list of charts in Delphic Oracle's main window:
You can then double click that chart to view it, or click the tool button just to the right of the help menu. You can also view it if it is highlighted by selecting Chart | View or by using the shortcut keys <Ctrl + U> (uni-wheel). If a chart is not highlighted or more than one chart is highlighted, this feature will not be available.
To compare 2 charts with one chart on the inside wheel and one in the outside wheel, use <Ctrl + B> (bi-wheel). A dialog will pop up with two drop down combo boxes, one for each chart...