Missing scroll beam in the designer

Hi experts,
Ihave a problem with the home remote designer.
I used the scroll viewer and on my iPhone I can scroll to the requested icon. But in the home remote designer I have only a horizontal scroll beam, the vertical beam is missing. Therefore the editing of the page is rather unconfortable.

Can someone help me?

Designing scrolling pages that are actually larger than your device display can be tricky. One likely solution is to temporarily change your simulator device size to something larger than your actual device.