Scrolling problem in Acrobat Pro DC

Hi everybody!!

I have a problem with my Acrobat Pro DC and my PDF files, on my Mac. I have search everywhere, but didn't found any solution. I'm sure it's probably a tiny thing to setup. But I tried lots of things in the settings and nothing changed.

The problem : when I open a PDF file, and I zoom on it (so when the page is not full viewed), when I scroll to the bottom of the page, I can't see the bottom. At around 1/3 of the page, the scroll pass directly to the second page, and the same for each pages, and each PDF files. And its very bothering.

FYI : I'm on MacOS Catalina, and My Acrobat Version is 2020.006.20034  Build: 20.6.20034.366983 (but I have the same problem with the oldies versions. Any update solved my problem).

I hope a succeeded to explain goodly. In case of, don't hesitate to ask me to explain agin in an other way.

Thank you for your help.