Zoom function on Cubase Element 11

Hi,
Is there any way to use the Zoom Function on the Score View on AI11 ?
The function seems to exist, but does not work (in contextual menu, the options Zoom in/out is grey and not selectable). Shift+Roll Mouse is not working to.

Little precision : On any other views (piano roll, main etc…), Zoom is possible.

Thank you for help.