By default, Squarespace generates the HTML for the standard summary card with the small image.
On my site, I have used code injection to add HTML for the summary with a large image into the HEAD of my documents. I did this both site wide as well as on blog pages:
However, Twitter still uses the summary card with the small image.
Twitter large summary cards
in Other
Posted
Site URL: https://agux.co
<meta name="twitter:card" content="summary" />
<meta name="twitter:card" content="summary_large_image">