Can’t find a folder "extra" on android studio’s SDK

  android-studio, sdk

I didn’t find a solution online so I’m creating a question. I’m following this tutoriel :
At some points, I have to download packages from an extra folder of the SDK, that I don’t have. Do ou have an idea of what to do?

Additionnal informations:
-I’m on windows 10
-I’m using Android Studio Arctic Fox | 2020.3.1 Patch 2

Thank you very much if you have any idea on what to do.

[Here is my SDK manager][1]

[This is the tools tab][2]

Source: Android Studio Questions