When posting adaptive cards to Microsoft Teams from Flow, the message appears to be squished to about 50% width. It doesn't expand to fit the message container in Teams.
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The "Full Width" Adaptive Card functionality was released at some point and is now available.
Microsoft has documentented how it works:
Constructing full width cards
To make a full width Adaptive card the width object in
msteams
property in the card content must be set to Full. In addition, your app must include the following elements:
{
"type": "AdaptiveCard",
"body": [{
"type": "Container",
"items": [{
"type": "TextBlock",
"text": "Digest card",
"size": "Large",
"weight": "Bolder"
}]
}],
"msteams": {
"width": "Full"
},
"$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
"version": "1.2"
}

Christopher Cashell
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this does not work when the card is part of a carousel – Moblize IT Dec 22 '21 at 22:10
1
Current behavior is by design, however we have backlog item to support full width adaptive card. I'll keep this thread updated.

Nikitha-MSFT
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Hi Nikitha, any update to support full width adaptive card on Microsoft Teams? – Python coder Oct 26 '20 at 04:17
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We are looking into it we don't have ETA to share when it will be available. – Nikitha-MSFT Oct 27 '20 at 04:19
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Can you please look into [this](https://stackoverflow.com/q/64480028/11844406) question? – Python coder Oct 27 '20 at 05:11
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We are working on it. WE don't have ETA to share when it will be available. – Nikitha-MSFT Feb 18 '21 at 05:13