Configuring Special Window Settings

Trying to configure the position of the Libreoffice window when it starts, with a particular doc, but without success.
Have configured as per
App still opens at last position.
What am I doing wrong?

Systemsettings5----Window Management—Window-Rules

This is my Mumble:

I have a 2 Monitor Desktop with 1920x1080 at every Monitor, so a 3840x1080 Desktop.

Playing around, I tend to think it is a Libreoffice issue - have put the same settings in another app, and works fine…