[Designer] (November 2023) New Microsoft Teams Adaptive Card rendering wastes a lot of space

Problem Description

Adaptive Cards rendering in new Microsoft Teams Version 1.6.00.29964 (64-bit)+ wastes a lot of space:

You can see from the above that they can't even fit 3 cards into 1 full window view (1920x1080).
Each card only has a heading with 3 lines of normal size text and a hyperlink at the end.
Zooming out one-level to 85% is not a solution as the text becomes too small (separate problem is why we can't zoom out to exactly 90%?)

The spacing / padding below the author / sender and the start of the card "Container" is way too much.

Card JSON

{
  "type": "message",
  "attachments": [
    {
      "contentType": "application/vnd.microsoft.card.adaptive",
      "contentUrl": null,
      "content": {
        "type": "AdaptiveCard",
        "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
        "version": "1.0",
        "padding": "None",
        "msTeams": {
          "width": "full"
        },
        "body": [
          {
            "type": "Container",
            "padding": "Default",
            "spacing": "None",
            "style": "default",
            "items": [
              {
                "type": "TextBlock",
                "text": "Main Heading",
                "color": "good",
                "spacing": "Small",
                "wrap": "true",
                "weight": "Bolder",
                "size": "Small"
              },
              {
                "type": "FactSet",
                "facts": [
                  {
                    "title": "Line 1",
                    "value": "{{Redacted}}"
                  },
                  {
                    "title": "Line 2",
                    "value": "{{Redacted}}"
                  },
                  {
                    "title": "Line 3",
                    "value": "{{Redacted}}"
                  }
                ]
              },
              {
                "type": "TextBlock",
                "text": "[View on {{Redacted}}](https://www.google.com/)",
                "wrap": true
              }
            ]
          }
        ]
      }
    }
  ]
}

Screenshot

No response

No source file or test is identified in the issue. Reproduce the supplied Adaptive Card JSON in Microsoft Teams version 1.6.00.29964 or later and compare the sender-to-Container spacing; done means the excessive whitespace is resolved without making the text too small.