Can't find that option. I'll just try a couple of things.

When you paste the link in the post you’re writing, on the bottom of the page “add link card” appears. It makes the link more visually pleasing in the post.

When you paste in a link, bluesky offers you a chance to make it public. Please read. michaelgallagherwrites.com/tips-work-ar...

Tips & Work-arounds - Michael Gallagher Writes

The bluesky app is still in development and many features you'll be used to aren't available yet. But there are work-arounds you can employ.