DebugPoint published a story that the app grid in GNOME 40 will scroll horizontally.
GNOME 40 App Grid Now Scrolls Horizontally
The GNOME 40 is under development at the moment. And a recent change on App Grid functionality shows that it now scrolls horizontally. If you use GNOME, you probably already know that until now GNOME always had the App Grid scrolls vertically. That means today, you have the App Grid page indicators at the right.
GNOME 40 App Grid Now Scrolls Horizontally