At the dashboard level there is CSS option(present in the draggable component which is also having file browser and settings). Click on that CSS and apply the below content.
width: 85% !important;
height: 99% !important;
Now all the images will be responsive.
Similarly, to make text responsive you can define the size of text as viewport and not pixel. Viewport is responsive and pixels are not responsive. You can refer to below code for reference
font-size: 1.1vw !important;