Just a dump of things that make my mind hurt and happy at the same time.
Found this issue when doing some training, where I had connected my laptop to two external monitors; a hp 27 inch monitor and a 55 inch sony tv. Having the training material on the Sony TV, I had to keep looking at the tv when scrolling. So after some googling found a solution where I could mirror my laptop main display to the sony tv and problem solved.
First confirm what connected display are present;
xrandr | grep -w connected
Next set the display so that the external monitor will mirror the current display;
xrandr --output [mirror-display] --same-as [main-display]