I have LibreOffice Version: 18.104.22.168. In a presentation, I can not chose from ‘Multiple Display’ in ‘Slide Show Setting’. How can it be made functional?
You need to attach a second monitor/beamer to your PC/Laptop and your graphic card needs to support different content for different devices. (My small netbook does not support it.)
And in Tools > Options > Impress > General enable Presenter Console.
If you want to have a look at the presenter console and do not have a second monitor at the moment, you can use the macro from https://issues.apache.org/ooo/show_bug.cgi?id=121873