I searched online and found an old post back 2013 (link below). It seems we couldn't open two PD at that time. Now we have a newer version PD 19. Can we do it now with newer version PD 19 Ultimate? So we can work on another project while PD is producing video (a lengthy process) for a different project.
https://forum.cyberlink.com/forum/posts/list/27392.page
Thanks & regards.