"Enable scrolling in single page view" on by default?

I had the same problem. Here's how to fix it on mac.

Preferences>Accessebility>Always use Page Layout Style>Single Page Continuous

Thom's solution is for the currently open PDF's Initial View setting (saved with the PDF).  If you want this as your default view setting, you can visit your Preferences and choose Page Display>Page Layout>Single Page.  This will be your default for any PDF that does not have a specific view defined.

I hope this is helpful.

My best,

Dave