How do I see all my brushes at once?

I would like to see all my brushes at once but because of the too wide icons of some brushes (I am not sure what is the difference between the small square iconed brushes and the brushes with the long rectangle icons) I cannot gain some place to see all my brushes, even if I extend the width of my brushes panel.

I don't want to use folders because there should be enough place to see all my brushes at once when I extend the width of my brushes panel.