Push Opera tabs all the way to the top

How can I push the tabs on Opera's tab manager all the way to the top, and remove that pixel space of padding it has up there?

Example (taken from Presto engine version of this question)

Opera Tab Manager Screenshot

I'm asking about the Chromium engine-based version of Opera.

How do I do this?


SETTING

User interface
Disable tab bar's top spacing when browser window is maximized