Did you have the opportunity to check the scheduler component on tablets and mobilephones. It’s not possible to scroll in this devices dragging the inner part of the calendar. Let me know if I’m wrong but the ux seems to be frustrated if you have to use scrollbars.
We tested it on IPad and Samsung phone with Android. We do not experience any scrolling problems. Make sure you did not enable desktop mode on your device. Otherwise, you will need to touch and drag the scrollbars to scroll up/down or left/right.