I appreciate you for performing some troubleshooting steps to resolve this issue. As of now, let's log in your QuickBooks account using a different browser and check to see if the scroll bar will appear.
These are the list of some browsers that QuickBooks supported aside from Google Chrome:
If you still get the same thing, it would be best to reach out to our Phone Support team. An agent will do a screen share with you. They'll be able to view your account and investigate this further. I'll show you how: