Digital Workshop

I know this is a stupid question and I should be ducking after I post this, but I can't remember how to do this.

I want to create an irregularly shaped window for my publication. I am using the latest version of Opus XE. Any kind souls who could point me to the answer?

Thanks

Set the publication Window properties to Display in window and uncheck all the options except Transparent Background, which should be set.
Go to the page properties and uncheck the Background option.

Thanks Duncan!