We have adaptive card whose thickness (width) we want to control
below is the json of adaptve card
Unfortunately, no, this is not a capability of Adaptive Cards.
Most of the style properties of Adaptive Cards are controlled by the card Host and not by the card itself. This is done to let the Host ensure that the appearance fits the local look-and-feel / themes and so the developer doesn't need to worry about making it look "right" in Teams vs. Outlook vs. whatever other app.
Width is one of those properties that has nearly zero definition support in Adaptive cards. To see this definitively, just look at the card manifest schema: http://adaptivecards.io/schemas/adaptive-card.json
This manifest json is the background definition used by all app Hosts to interpret your adaptive card json. Search the word "width": you'll ONLY find it as an attribute of "Column", "TableCell" and "Image".
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