This process won’t work unless the measure 
 in question has a Beat Chart (see Document 
 Options-Music Spacing or To 
 create a beat chart in one measure.
        
        
            - Click the Measure tool   . Two stacked 
 handles appear on each barline. . Two stacked 
 handles appear on each barline.
- Click the second from the top barline handle 
 of the measure in question. The beat chart appears above the measure. 
 The top row of handles indicates the positions of the beats according 
 to the time signature (as they were before you respaced the music). By 
 dragging a handle on the bottom row, you can reposition a beat in all 
 staves at once.
When you click on the bottom barline handle, 
 a beat chart appears. The top row of handles indicates the positions 
 of the beats as they’d fall with linear spacing, and the bottom row of 
 handles allows you to move beat positions by dragging them.
        
            - Drag the desired beat’s handle horizontally. 
 If you press shift while dragging, all handles to the right of the dragged 
 handle move in tandem. If you double-click between two top-row handles, 
 a new handle appears, which governs the position of the beat halfway between 
 the handles on either side. 
- If you double-click any top-row handle (except 
 the first), the Beat Chart Element (#) dialog box appears. See 
 the Beat Chart dialog box 
 for more details.