I think that was a System 7 bug? Read the "Read Me" that installed with system.

INSTALLING SYSTEM 7.1 ON A MACINTOSH QUADRA 700 AND 950

 

To install System 7.1 on a Macintosh Quadra, use the Installer program’s Easy Install option, or choose “System software for any Macintosh” in the Installer’s Customize window. If you use the Macintosh Quadra option in the Customize window, some parts of the Monitors control panel will not work correctly.

http://shrani.si/f/17/Fp/3l0NsYCY/picture-1.jpg