No horizontal scrolling in calendar 5.0.1 (3)

Situation
We just updated from 5.0.0 to 5.0.1 (patch 3). After the update, we can no longer scroll horizontally in the calendar.

OpenEMR Version
5.0.1 (3)

Browser:
I’m using: Chrome, Firefox (latest).

Operating System
I’m using: W10, Mac

I saw something from 2011 about updating the CSS for bigCal. I can do that just fine, but I’m wondering why this changed in this version?