R powered custom visual: image doesn't scale when I resize the visual

Hi all,

I have an old R custom visual (built with old visual tools) that I need to modify.

I haven't found the migration guide to version 3.0 of power bi visual tools, so I created a new package using the same R script and the same capabilities.json.

The custom visual works but it's unusable because the image doesn't scale down automatically to the visual size, as it did with the old version.

The problem does not depend on the script and the package used (gridExtra): I pasted the same R code in the R visual and the image scales up and down as expected.

Any idea to solve this issue?

Thanks

pbiviz --version
3.3.2

package.json

{
  "name": "visual",
  "dependencies": {
    "@types/d3": "^5.0.0",
    "core-js": "^3.2.1",
    "d3": "^5.0.0",
    "powerbi-visuals-utils-dataviewutils": "^2.2.1"
  },
  "devDependencies": {
    "powerbi-visuals-api": "^3.8.4",
    "tslint": "^5.18.0",
    "tslint-microsoft-contrib": "^6.2.0",
    "typescript": "3.6.3"
  },
  "scripts": {
    "pbiviz": "pbiviz",
    "start": "pbiviz start",
    "package": "pbiviz package",
    "lint": "tslint -c tslint.json -p tsconfig.json"
  }
}