This is not possible within Acrobat.
The only thing you might be able to do (if you are not on a laptop with maximum screen size already selected) would be increasing the screen size in the monitor settings of your computer.
Because the icons have a fixed size in pixel an increased screen size would allow to display more pixels, and therefore more icons.
OK, there would be one more possibility, but it is something "you would not do at home": snitching the icons from the application, and make them smaller… But then, don't complain if you accidentially have blown up the application…
Hope this can help.
Max Wyss.