Dashboard image not fitting

HI  rolopezteteruk ,

There is no option to resize images directly. You need to define the properties with JSON code and upload the theme file into dashboard.

{
"imageHeight": {
          "type": [
            "numeric"
          ],
          "displayName": [
            "Image height"
          ],
          "description": [
            "The height of images in pixels"
          ]
        },
"imageScaling": {
        "imageScalingType": [
          {
            "value": "Normal",
            "displayName": "Normal"
          },
          {
            "value": "Fit",
            "displayName": "Fit"
          },
          {
            "value": "Fill",
            "displayName": "Fill"
          }
        ]
    }
}

Reference:

https://docs.microsoft.com/en-us/power-bi/desktop-report-themes#report-theme-json-file-format

https://community.powerbi.com/t5/Desktop/Dashboard-Background-Image-Size/m-p/924565 

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

Best Regards,
Lucien