Scale every page to a standard paper size
No. Content is scaled to fit the target size with its aspect ratio preserved, then centred, so nothing is stretched. If a page's shape differs from the target, you get even margins rather than a squashed image.
Auto decides portrait or landscape for each page based on its own shape, so a document mixing both keeps every page the right way round. Choose Portrait or Landscape to force one orientation for the whole file.
A3, A4, A5, US Letter and US Legal. Every page is scaled to the exact dimensions of the size you pick.
Yes. Scaling is a vector transform, so text and graphics stay sharp. Note that interactive form fields and links are not repositioned when a page is resized — resize static documents, or flatten a form first.