[Lazarus] New experimantal beta feature - View same source in multiple Windows

[Paul Ishenin]

Martin wrote:

> Compiling Lazarus (SVN / Snapshot) with   -dSynDualView  allows you to 
> open a 2nd window for any open source file. 

I compiled but I don't see the second window. How to activate it?

Best regards,
Paul Ishenin.