Using the example image I gave earlier, note how I have a second preset there called 16pp A4 that I've made. If I go file, document presets, and select 16pp A4, I'm presented with the new document prompt. If I OK it, close it, and then go Ctrl+Alt+N, InDesign will make another 16pp A4 document preset based file. To get back to the default, I have to:
go back to file, document presets,
select [Default],
OK the document prompt,
close the file it makes, then
Ctrl+Alt+N
and now the next document will be based on the [Default] setting.
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