1. Please install extension from https://appexchange.salesforce.com/listingDetail?listingId=a0N30000000q4pAEAQ
  2. Once installed, it will appear as icon  in Google Chrome 
  3. Click same to configure extension.
    1. Check Refresh checkbox to enable Auto Refresh Dashboard at said interval
    2. Check Show 4/5/6/7 columns checkbox to enable Increase Columns in Dashboard

  4. Uncheck the checkboxes to disable these features.