You can view the contents of a hidden construct by typing S (show) against any line indicated by three dots (...) and pressing Enter. This expands the selected hidden construct. Note that when you expand a hidden construct the three dots change to > to indicate that the entire construct is displayed. You can hide the construct again with a Subfile selector value of H (hide).
When hidden constructs are displayed, the whole action diagram occupies more than one panel. To simplify editing an action diagram, you can display hidden constructs individually by typing Z (zoom) in the Subfile selector. You will use this in the next step.
As you will see in the following steps you can zoom into hidden constructs at continually deeper levels of the action diagram. At any point you can reverse the effect of the last Z you typed by typing U (unzoom) in the Subfile selector. To return to the topmost level, type T (top) in the Subfile selector.
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