To manipulate screen size with scale option

If craphic card does not allow big enough resolution, one way to manipulate screen is to scale screen size. At first need to know display port

xrandr | grep connected

Also screen size is good to know

xdpyinfo | grep -B2 resolution

If wanting a ”bigger resolution”, place your display output on the output section like VGA1 (in this computer is LVDS).

xrandr --output LVDS --scale 1.25x1.25

If wanting a ”smaller resolution” set a different value like –scale 0.75×0.75

xrandr --output LVDS --scale 0.75x0.75

To restore original size

xrandr --output LVDS --scale 1x1

Of course you can add the command to the startup applications or script