brushes dialogue missing buttons

[Bearpecs]

In the attachment is the Brushes Dialogue box I see when I open GIMP.  The documentation says Iʻm supposed to have buttons at the bottom of it for

• Smaller previews
  
• Larger previews
  
• View as list
  
• View as Grid
  
• Open the brush selection dialog
  

As you can see, I have none of those.
What am I doing wrong?
Thanks