Scroll goes "off screen"

When too many instruments are added, the score scrolls off the screen. It's still visible, but you can't add notes to it. The workaround for this is to go to Format | Style, Hide Empty Staves within Systems.
It works because thus far I haven't had every single instrument playing at one time. But, does anyone know another workaround for this? If I DID want all instruments playing... not sure I could?