Does anyone know how to do this in KDE? I searched but I’m not even certain I’m using the correct words. To me, I want to “scroll” a window left & right.
Normally, you do this by grabbing the slider at the window right or bottom with the mouse and dragging in the direction you want. The mouse wheel usually defaults to up & down window scrolling.
I’m currently working with Audacity and Kdenlive that have wide left-to-right timelines of work that extend far past the screen edges. I want to be able to scroll left and right quickly from the keyboard as I work.
The sliders in the Firefox case are sliders provided by Firefox (not by the window manager).
Thus the answer should be: it depends complete on the program.
Another example is Konsole. The vertical slider that lets you scroll through the lines above what you see, is driven by the mouse wheel, The up-down arrows are used to re-call shell commands from the command history.