Vitux published a tutorial about enable and disable Touchpad edge-scrolling on a Debian GNOME desktop.

Enable/disable Touchpad Edge-Scrolling on a Debian GNOME Desktop

While using a mouse with a middle wheel, you can scroll up and down easily on lengthy web pages, documents, and about anywhere where there is an option for scrolling. On a laptop, there is an option to scroll up and down by using the extreme right edge of your touchpad. While this edge scrolling works fine for some, a few of you might find a real nuisance as it might mess up with your current view if you accidentally touch or swipe up and down on the right-hand side of the touchpad. Keeping the personal preferences of all users, Debian has kept this option customizable. You can enable/disable this feature through the Settings utility on the Debian graphical user interface.

Enable/disable Touchpad Edge-Scrolling on a Debian GNOME Desktop