I am wondering why by default the standards A0, A1, A2 are missing on Illustrator.
Is there any rationale behind this?
Answer
By default adobe tries to give you only the most common page sizes.
But you can add new ones by opening one of the preets and saving a new file.
They are located somewhere like this:
(path will be be different on windows or if app version is not the same)
~/Library/Application Support/Adobe/Adobe Illustrator 25/en/New Document Profiles/
Attribution
Source : Link , Question Author : nowox , Answer Author : Julian Steinmann