How can I make my website look like this on Google?

My website used to show like this on Google, but from last few days it just showing the website like a normal post.

I am 100% sure it can be done manually also in a very systematic way. But now sure how to do that on Wordpress website

Can’t be done manually. It’s automatic.

But depends a lot on the primary navigation of a website, and how you structure it.

How is it possible that i was showing like this few days back but not now?

Have you changed anything in the menu recently? or URL of the main pages? or traffic loss?

nothing changed

Then wait, maybe it will come back. But other than the menu structure, you can’t really do anything to get this in the search results.

it’s believed that this started after recent tests/updates pushed out this week.