I just found that I can reproduce the issue using the VM when I have a 24" display on my desktop and maximize the VM's window.
Attached are three screenshots of the VM.
Small - banner above the login dialog with scroll bar
Medium - banner on the left side of the login dialog with scroll bar
Large - banner in column overlaying the login dialog without scroll bar - this is what the physical machine with 24" display does all the time
Thank you kindly for your consideration!