Adobe’s Colin Fleming shares this favorite keyboard shortcut modification:
I use cmd/ctrl+shift+W as a secondary Fit Spread in Window shortcut.
It’s a classic Freehand shortcut, can be done with one hand as opposed to cmd/ctrl+opt/alt+0. The default behavior for this shortcut is to close your document window. You’ve already got cmd/ctrl+W to do that, so re-purposing cmd/ctrl+shift+W is a no brainer.