Extend the height of the canvas without impacting the created KPIs

Hi, I should be able to increase the height of the canvas smoothly, without incuring the size impact of the designed KPIs, currently if the resolution is changed the KPIs widgets are increasing its heights automatically. It should rather provide a tick box, that if the user not wishes to increase the widget height and width, then it should only increase the height and width of the canvas only. Thanks.