Comma in 1000 separate in Excel app does not work Even i check the box "use 1000 separate (,)" but nothing is shown in the number. Please Help
In System Preferences > Language &amp; Region, you need to select the Region setting as "United States" instead of "United States (Computer)". You'll need to relaunch Excel after this. 



This setting is required in Excel 2011 only. In Excel 2016, it works fine.