Enlarge Zoom thumbnail

[Figaro14]

When I need to reduce the person I'm meeting with in order to have a document on my screen, the thumbnail is extremely small.  In Skype and other meeting platforms, I'm able to use the mouse to resize the image.  Zoom doesn't seem to be able to do this.  There must be some way to enlarge the thumbnail.  The person I'm talking to is barely visible in the default size.   When I Google this problem, the result I get is to hit 2X, but that solution does not work. 

[Rupert]

Hi @Figaro14 

Do you have more than one monitor on your computer?