Question Urgent: MS Word page view

Pimpom

Distinguished
My surgeon nephew just called me on WhatsApp video during a short break from an operation.

He has a template for entering surgery notes. He said that he wiped something from his keyboard while he was typing and that caused the active page to move to the left side. From what I could see during the call, the page occupies less than half of the width but it wasn't a normal zoom out. The fonts are still near normal size. The right side of the Word window is a blank white space, not grey.

Closing Word and starting it again makes no difference. He said that the document prints out normally. So it's most likely a view setting.

So can anyone suggest a way to restore normal view?