I only added the custom card as quoted. Dashboard.is set up as the new style (drag and drop)Depends a bit on how you've set up the dashboard - try looking at the grid layout card and putting your CCTV cards in there, you can make full width or however many columns widths you want.
If you want to force it, you could use CSS, eg
type: picture-entity
entity: camera.your_camera_entity
style: |
ha-card {
--ha-card-box-shadow: none;
height: 300px; // Adjust height as needed
width: 400px; // Adjust width as needed
}
Just paste this in your card YAML editor