Dual Monitor Setup : Login Page on Wrong Monitor

Even though I changed my Display orientation inside Ubuntu and set it up properly, It always put my Login screen in the wrong window with Wrong orientation (Vertically set up monitor showing Horizontal Ui ). Looking at display where your text is going towards the Moon, i will pass ...

So bit of a google search and a solution

sudo cp ~/.config/monitors.xml /var/lib/gdm3/.config

What i understand even i change the monitor orientation and all the settings, Gnome Display Manager does not update the config of the Montiors Properly(!?). So by copying the monitor config to the Gnome Display Manager config manually resolves the issue!