Problems With Expanding Zoom Within My Window

Before the update a month ago I was able to expand the size of my Zoom meetings within my screen window which is usually 1/4 the size of my monitor.  Now after the update I cannot expand Zoom within my window. Yes I can expand the size of my window to take up the whole monitor but I like to have my Zoom Meetings on only a 1/4 of my monitor so I can see it better.  Any advice please to fix this problem?  Thank You - Steven