How do I hide my opponent's rating? (Dasher)

Click on the Settings Icon  from the top toolbar > A window opens with Tabs above it. Click on 'Playing'
Or menu above: Edit > Settings > Playing Tab  
<!--[if !supportLineBreakNewLine]-->On the right you will find 'Display Options'.
Check 'Hide opponent's rating until after the game' and click on OK.
Your opponent's rating will now only be displayed after a game has finished.