They should transfer over to your main display (at least that's what happens for me). This utility might help you see what's going on: https://github.com/Jaysc

They should transfer over to your main display (at least that's what happens for me). This utility might help you see what's going on: https://github.com/Jaysce/Spaceman https://github.com/Jaysce/Spaceman. And while we're on Spaces, this utility forces mission control to show full thumbnails of all spaces by default: https://github.com/briankendall/forceFullDesktopBar https://github.com/briankendall/forceFullDesktopBar