2445 CH 3 and CH 4 vertical setting - volts/ div where ?


Just adjured 2445 scope and trying to get familiar with the controls.
Not having much luck asking Mrs Google or reading text only ( no links / reference ) manuals.
So - any owner of 2445 can tell me where / how to select vertical "Volts/Div" setting for CH 3 and CH 4?
I can read the calibrator on CH3 OK , just cannot figure out how to set the vertical setting for it.

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