How to view drawings side-by-side in AutoCAD | AutoCAD ...
View separate drawings side-by-side. Open a second instance of AutoCAD. When double-clicking a DWG file in Windows, the drawing opens in AutoCAD. Then, launch a second instance of AutoCAD from the Start menu or desktop shortcut and use the OPEN command to open a second drawing. This will allow to position the two AutoCAD instances side by side.