Normally, I only need to scroll up and down, but when using software like trello, waffle.io, a text editor with large amounts of code on a single line, etc, I need to scroll horizontally.
Using the trackpad, this is easy, just two finger swipe and it will go in the direction desired.
But lately, I've been putting my laptop far away, using external mouse, display, and keyboard.
How can I scroll horizontally with the external mouse?