Thank you for your bug report, can you take a screenshot showing the fullscreen status? Also what screen resolution are you using? The calendar default being the text editor mentioned in the title is known as bug #876689
** Changed in: gnome-control-center (Ubuntu) Importance: Undecided => Low ** Changed in: gnome-control-center (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1855569 Title: The application does not open on the main monitor, but on the secondary one. Also, the text editor is incorrectly specified as the default application for the calendar and cannot be changed. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1855569/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs