The appDisplay.js file which could be used to set icon size and grid properties of the application overview (Super+A) in Ubuntu Gnome 14.04 is not available any more in Ubuntu 16.04 shipping with Gnome 3.18.

In most displays, having only the default six columns leave a large empty space on each side of the application grid, which could be used to avoid scrolling three or four pages down in the all-applications display and simply make better use of the available space. Where is that value defined? Is it possible to configure the number of columns to be computed according to the available space or to set it to a higher value?