acrobat-make page thumbnails always show up as a default

Thank you, Jain. I will try your suggestion. I can't understand why that feature was removed; page thumbnails were always visible upon opening in previous versions. There are other strange happenings in Acrobat Pro, like a page opening very large, showing only half the document. When using type, the font default is odd and very small—7point! And unlike Illustrator or Photoshop, which shows the previously used fonts on top of the list, you have to scroll down this huge list to find a common font like Helvetica.