How to Change the View

When opening a PDF document it is zoomed at 173%, which is "Fit Width". I want them to open at 100% or Actual Size.  Every time I open a PDF I have to click on View, then Zoom, then click Actual Size. I have gone to Adobe Acrobat Professional and clicked on Edit, then Preferences, then under Default Layout & Zoom and changed from "automatic" to 100%, hit OK -- but nothing changed, even after a reboot, which is sometimes needed to hold changes. I work with PDFs quite a bit & it's just frustrating to have to keep changing the view. Thanks for any assistance you can provide.