I noticed that when you want to create a new document into Affinity Publisher that there is no option to create a bloc zone. This option is important to me, because when I am doing a three-folds folder or more, I want to place my folder's marks inside the bloc zone. As an example, I use to put a bleed of 3.125 mm, plus a bloc zone of 12,7 mm over it.
As an example, I saw some design where the folder marks were not perpendicular to get irregular and angled folds, in such a case, it is important to be able to have a bloc zone where to place these folders marks.
That said, if Affinity Publisher will eventually integrate an option for the bloc zone, then we should have to an option to include too this bloc zone within the dialogue boxes at the PDF creation time.