You can move the content of windows that have horizontal scroll bars to the left or right using the keyboard and the mouse.
Procedure
Move contents to the right: Press the Shift key and scroll down the mouse wheel.
Move contents to the left: Press the Shift key and scroll up the mouse wheel.
The content of the window is moved. If the window does not have a horizontal scroll bar the content is moved up or down. This means, it is moved as if you did not press the Shift key.