I can't BELIEVE that after all the uproar about this, all thru the PD12 life cycle, this wouldn't be fixed in PD13! I know the moderators read these threads, because one commented on this very one way back in page one of the comments. (Note that was back in August 2016! It's a year, it's been a year.) Reading through the thread,
Parallels says it's because "Up to 11th version, we have used our custom Full Screen mode in Parallels Desktop for Mac, which basically did not use system's native Full Screen, but instead, we were just showing a borderless window resized to full display size. It had its benefits, but in Parallels Desktop 12 for Mac we dropped support for non-native macOS Full Screen mode, as it caused a lot more issues while playing games, working in CAD software and in similar use cases. "
Well, guess what. I don't play games, or use CAD software. Why can't this "borderless window" mode be a setting? I want PD to have the PC as its own space, with all the monitors active. That's it. Just like it used to work.