Drum window, Navigation, Scroll – Arturia BeatStep Pro MIDI/Analog Controller and Sequencer Kit with CV/Gate Cables (Black) User Manual
Page 108: Zoom, Drum window [p.103

10.7. Drum window
10.7.1. Navigation
10.7.1.1. Scroll
If you have a scroll wheel you can move the pattern view horizontally. Place the cursor
in the pattern field (not over the pad names), then hold the Shift key on your computer
keyboard and use the scroll wheel. The pattern view will move sideways.
You can also click/drag the scroll bar at the bottom of the window to reposition the pattern
view.
10.7.1.2. Zoom
To zoom in and out of the horizontal view, place the cursor in the pattern field. Then press
Command (Mac) or Control (Windows) and use the scroll wheel to adjust the view.
Scroll bar location
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Arturia - User Manual BeatStep Pro - MIDI Control Center