Problem

Upgrading my system (new Linux flavour, new ecFlow version), ecflowview popping windows are ignored when virtual displays are used.

Solution

With KDE, open the window "System Settings - Window Behaviour" check "Focus Window Prevention" is set as expected (None)

Also ecflowview title might be changed so that the "Window Rules - Appearance&Fixes - Accept Focus" is activated. "Window Rules" enables ecflowview window size and position settings too.