What the heck is that?

Hi, all – I had PS 4.0 years ago, but a friend has 7.0, windows system. I was helping him make a small anigif, icon size, but I see up in the top left had corner of the image canvas, what looks like two boxes, one has a number in it, the other I can’t tell, and they aren’t "clickable" nor does a mouse hover tell us what they are. I don’t ever remember that in 4, or even 6.0, which he had before this.

What are those, and is there a way to "hide" them, because the are almost as big as the actual size of the icon we’re working on.

Thanks in advance!