Where does a volume controller enable in the key editor?

Cubase
1

Hi, guys! I’m sorry for my stupid question… But where does a volume controller enable in the key editor? Unfortunately, I even don’t know how is it called correct, so I attached a picture to show it.

Безымянный.png
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P.S. On the picture the green block (that I drawn) was drawn for each event. I want to return this option now.

2

Click the “+” in the bottom left to open a controller lane. Select the volume if it doesn’t open volume by default.

3

As Jaslan says the + sign will open the lane.
Judging by your description, I think you want to select “Velocity” rather than “Volume” though…this is how it would have been set at default.