This is a GNOME Shell extension to set the max number of columns in the "applications grid" view (by default, this maximum is only 6).
The actual number of columns is still computed the same way, depending on your screen aspect ratio: there are 4 lines, and icons are square, so no magic possible.
Usually with a 16:9 aspect ratio, you can have 8 columns (see screenshot). With a 4:3 aspect ratio, the extension has no effect.
Compatible with GNOME Shell 3.18 to 3.36
After the installation, you need to restart GNOME Shell ("logout and login again", or Alt+F2, r
, Enter).
You can get it from here
Clone the repo (or download it as ZIP and extract it), and run ./install.sh
Arch Linux users can install gnome-shell-extension-more-columns-in-applications-view-git
from AUR.
(I don't maintain that package, i've no idea if it's up-to-date).