1. The left menu icon key is deprecated and retained for backward compatibility. The icons key has been introduced to support separate light and dark fields for both themes:
{
...
  "left_menu": {
    ...
    "icons": {
      "light": "images/light.svg",
      "dark": "images/dark.svg"
    },
    ...
  }
  ...
}
  1. Widget icons displayed in the left menu must now comply with the icon checklist for public integrations.