Dolly zoom (move the camera) or lens zoom (adjusting the focal length)? You can do the former with the mouse wheel or by left dragging on the magnifying glass icon at top-right of the viewport; you can do the latter by right-dragging on the magnifying glass icon at top-right of the viewport. You can also select the camera and adjust its settings via the Parameters pane.
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Dolly zoom (move the camera) or lens zoom (adjusting the focal length)? You can do the former with the mouse wheel or by left dragging on the magnifying glass icon at top-right of the viewport; you can do the latter by right-dragging on the magnifying glass icon at top-right of the viewport. You can also select the camera and adjust its settings via the Parameters pane.