p - Toggle Preview Pane
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Press p to open the preview pane for the selected work item if it’s hidden or hide the preview pane if it’s visible.
ctrl+d - Preview Page Down
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Press ctrl+d to shift the view for the preview pane down one step. The first line in the updated view is always the line after the last line of the previous view.
ctrl+u - Preview Page Up
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Press ctrl+u to shift the view for the preview pane up one step. The last line in the updated view is always the line before the first line of the previous view.