Enlarge and reducing from a group of four

A couple of days ago I wanted to look at one of the four accounts I have on Smart Charts, so I selected "enlarge" to look more closely at that particular chart. I went to put it back in the group of four, but can't find where to put it back. I'm used to the small boxes on the upper right corner, but those are not there. I've clicked on just about everything else, but can't get back to the for I originally started with.