How do I resize the Transform Tool?

how do you resize the transform tool?

I need to make it thicker and bigger along with the control section in the middle. I have seen this done in some videos. But I have not come across how it is done.
I believe that I will find a solution only in this forum.

By the way, the one explained below is not a solution, it just extends the arrows! And, Alt+left bracket does not work for MAC.