Currently, EasyWorship does not have multiple live outputs.
If you are using NDI
You can only output to the projector screen or use NDI to send out the stream, but can't do both at the same time in EasyWorship. You would have to use two computers both running EasyWorship. One computer that has EasyWorship projecting to the congregation screen, and the other computer running EasyWorship that is sending out the NDI signal.
If you are using Display Capture
The other option is if you are only using one computer with at least two monitors, you can use the display capture option in your streaming software. This allows you to display your EasyWorship live output to your secondary monitor, and then using your streaming software's display capture option to capture your secondary monitor which is showing your EasyWorship live output.