You may notice that when you open up either Adobe Reader or Acrobat that the PDF document appears to be zoomed either too far in or out. There is a settings change you can make to ensure that documents are at your preferred zoom level every time you open them.
To change this setting, go to Edit at the top of the window and choose Preferences from the drop down menu.
In the menu on the left, select Page Display. On that screen up at the top there will be a section called Default Layout and Zoom.
Here you can select what percentage you want your default zoom level to be. It is recommended that you set this at 100% but can you can choose what works best for you.