3D Editing Toolbar
This toolbar is not visible by default. It contains functions that can be useful in editing the structures in 3D.
To make it visible, choose View > Toolbars > 3D editing.    
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         Assign Atoms  | 
                
         Maps atoms to merge.  | 
        
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         Merge  | 
                
         Merges assigned atoms.  | 
        
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         3D Plane  | 
                
         Alters the coordinates of the molecule in order to put the 3 selected atoms of the molecule onto the plane of the canvas.  | 
        
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         New Substituent  | 
                
         Adds new fragment to the canvas.  |