How do i resizing my piano roll in cubase 10.5?

it was standard size before, but i dont know what i’ve pressed, it got small and now i dont know how to get it back

I am using Cubase 12, but I don’t think that something has changed in this department, since C10.5. So :

It’s important to drag the mouse cursor over the right of the “keyboard” because nothing happens here, until the edge of it is reached.

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THANKS!!! it works, this resize thing kinda annoying hahahaha, thanks man!, u save my time

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Alternatively you could use the Slider control in the lower right of the Key Editor Window.