New Outlook for Mac

I am using the New Outlook for Mac.  I always have 3 Outlook Windows open, one for my email inbox, one for my VP's calendar and one for my Principal's calendar.  Now when I make a change in, for example, my VP's calendar/Outlook Window, the Outlook Window that has my Principal's calendar open opens my VP's calendar additionally side by side.  I never had this issue with multiple open calendar/Outlook windows in the old Outlook for Mac.  Is there something I can do to prevent this from happening in the New Outlook for Mac, such as a setting somewhere that needs to be turned on/off or selected??