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