Use a large-image X card
Open Pages & forms → Shared settings → Browser & social sharing and set the X card title, X card description, and X card image. Save the defaults. This is separate from Suggested post text, which is the text offered in the share composer.
For one page, open Manage → Page settings → Link preview. Under X overrides, select Large image as the card type and add any page-specific title or description. Leave an override blank to inherit the default preview. Save the page settings, then share that page’s public URL to check the rendered card. An external service may keep an older cached preview for a while.
See customize social sharing previews for the other platform defaults.
Need help? Email support@kickofflabs.com with your public page URL and a screenshot of the card shown on X.