How is the ID displayed?

I've been playing minecraft for about 4 years and always watch Minecraft videos on Youtube. Most Youtubers e.g. The item ID was displayed, but not for me and so I wanted to ask how to display the ID.

Can you change in the settings. I have it too, but I have no idea where exactly

It is F3+ H.

https://www.minecraftforum.net/...cks-in-the

Thanks! 🙂