How to create a tab with panels?

[Guest]

Hi, so I want to have two panels made into a tab. However, it will not give me the option to.

What I want: 

(You can easily switch.)

Though, mine only lets me put them next to each other.

Am I supposed to be hitting a key? I am not sure. If you know how to do it, please let me know! 

[Ro Hackett]

You click and drag from where it says tracker onto purple tab ... when you see purple tab you let go of mouse yes? 😮🤔