Hi Guys, I need help with this.

So I am learning blockchain development by myself,
I am following a video tutorial about creating an ethereum wallet.
In this video tutorial the application which I used is windows terminal, running ubuntu and using truffle framework.
In the middle of the video, the instructor suddenly opens a tab on the left side (as you can see from the photo below), without giving any explanation about how to open the tab. I heard him pressing his keyboard and suddenly the tab on the left just popped up in a split second. So, I was assuming that he was using the shortcut key to open that tab. And also I already search on Windows Terminal settings and I can't find the shortcut key he used to open the tab, even more I tried it one by one, I mean all of the shortcut keys that I can find in Windows Terminal Settings. And I already googled about it and I can't find any answers related to it.

I know this is a silly thing, because I understand it just a basic thing in how to operate windows terminal. But since, I am self-learning about Blockchain development and I am just following the tutorial video. So, I am stuck in this step.

I really need to know, How to open this tab, it would be a major help to me if you guys can tell me how to open the tab, Thanks in advance.

Note:
Video Tutorial source: Eat The Blocks, 6-Figures Blockchain Developer
Instructor: Julien Klepatch