The subsection Chapter I > “First Contact” > “More About DISPLAY” would look good in the chapter “Execute & Format Control”, where output is discussed at length.

However, the “More About DISPLAY” section talks a bit about enclosed/nested arrays, which haven't been properly introduced in “Execute & Format Control”.

Another alternative would be to take the “disp and display” sub-subsection and merge it with the “More About DISPLAY” subsection, in the “More About DISPLAY” subsection.