- Choose Document > Document Options > Notes and Rests.  
- Select Rests Characters > Default Measure Rest from the Rests 
 Characters  and click on Select.
- Select the rest symbol you would like to use 
 from the Symbol Selection dialog box. Any characters selected other 
 than rests will be ignored.
- Click Select.
- Click OK. All your default rests are 
 now displayed using the selected character.