Switch Windows in Pages
It looks like Pages overwrites the command + &lt; shortcut to zoom out the view even though that's the default shortcut for moving focus between windows on a German keyboard.



You can go in to System Preferences -> Keyboard -> Shortucts to redefine that shortcut in Pages. Click App Shortcuts, click the + button, select Pages from the Application list, enter your equivalent of "Zoom Out" for the menu title, and enter a new keyboard shortcut.



In my example, I assigned command + back tick to Zoom Out and now in Pages that shortcut zooms out the view instead of switching windows.