To facilitate viewing and working with members in very large outlines, you can split the Outline tab into multiple views of the outline and work separately within each view (pane). You can divide the tab into two or more vertical and horizontal views.
To enable the multiple view process, open the outline in editing mode. The Outline tab is displayed.
To split a view of the outline tree into two side-by-side panes:
Right-click anywhere within the pane to be split
From the shortcut menu, select Split view horizontally.
To split a view of the outline tree into two panes, one above the other:
Right-click anywhere within the pane to be split
From the shortcut menu, select Split view vertically.
To return the Outline tab to a single view:
Right-click anywhere within the pane containing the single view to be retained.
From the shortcut menu, select Close other views.