It says "press and hold the pencil to get the blob brush", but the blob brush is its own group. It shows that there should be another tool, but there isn't.
Hi Harshika, today it looks like in your screenshot.
A couple of days ago it didn't and the blob brush was its own tool. It also doesn't seem to be related to the intro file. So it worked OK in a new file as well as in the intro file.
I have some trouble to open the hidden tools though, but after a few times clicking on a tool I can get them.
Thank you for doing a thorough test. I attempted the same action on my end, and upon pressing and holding the pencil, I indeed encountered the Blob brush, as illustrated in the image below. Could you please provide further details if you're not observing this Blob brush? We would like to understand more about this Intro thing.