THANKS, guys. I will continue to investigate further and post results.

FWIW, my search found 3: Mouse wheel scroll, Auto hide scroll bars "in Windows" (mine is ON), & Hear a tone when pressing Cap Lock, Num Lock, or Scroll Lock... though I have no Scroll Lock.

Sidroe
THANKS, guys. I will continue to investigate further and post results.

What version of Windows 10 are you using? I'm running Windows 1803 Home on my laptop, and Windows 1803 Pro on my two desktops.
 
Maybe earlier versions of Windows 10 don't have this option? It was first introduced in a preview version build 17083, but the option wasn't fully implemented until build 17110.
 
The registry key involved is:
HKEY_CURRENT_USER\Control Panel\Accessibility

DynamicScrollbars DWORD

0 = off
1 = on
 
There's an article about it here:
 
https://www.tenforums.com/tutorials/103061-turn-off-automatically-hide-scroll-bars-windows-10-uwp-apps.html
 
Note that it only affects UWP (XAML) apps, so it may be completely inapplicable to CbB.
 
M.
 

I am running 1803 Home. Still digging for a solution. Will check in later. Seems to have affected just the Piano Roll controller window in the Drum Grid as of now. This gave me a reason to dive into the Grid Editor in Superior Drummer 3 !!!! All I can say is WWWOOOOWWWW!!!!!