Click the Show two vertical editors button 
(or choose View > Show Two Vertical Editors) to display two vertical editors side by side. You can open multiple tabs in each editor.
If you need to work with multiple files in an editing session, you can divide the Sound Forge interface horizontally or vertically to view multiple editors at once.
When you open a file, it is added as a new tab in the active editor.
When multiple editors are visible, click a portion of the editor to make it active. A border is drawn around the active editor so you can find it easily.
Click the Show two vertical editors button (or choose View > Show Two Vertical Editors) to display two vertical editors side by side. You can open multiple tabs in each editor.
Click the Show two horizontal editors button 
(or choose View > Show Two Horizontal Editors) to display two stacked horizontal editors. You can open multiple tabs in each editor.
Drag a tab to move it within the editor. You can rearrange tabs or move them across sections of the editor.
When viewing a single editor, you can drag a tab to the right edge of the editor to split the editor vertically and move the tab to the new editor.
When viewing a single editor, you can drag a tab to the bottom edge of the editor to split the editor horizontally and move the tab to the new editor.
Click the Show single editor button 
(or choose View > Show Single Editor) to return to a single, tabbed editor.
