Getting rid of a bounding box

#1

I’m asking this question on behalf of a friend. He is very new to Maya and is trying to model a brain. This is what he has so far:

Your suggestions for how he could go about modeling would be appreciated, but he is not sure how to remove the box. I’m not sure myself. He was doing something in Hypershade too. Thanks for your help!

#2

looks like a texture placement node.
if you dont need it you can just delete it. if you do need it then you can go show>texture placements and untick it in your view

#3

When we try to delete it, nothing happens. I’ve looked all around for various ways to get rid of it. I’ve even tried to hide it, and it does not hide.