Just asking to anyone else (who use Windows version beta and official release of 19.04) if the "title clip" editor
starts with a vertical size of 1400/1500 pixels (i need to resize this windows everythime to make all controls on the screen) .. the app starts correctly on primary screen.

i have a dual monitor VERTICAL setup (the upper monitor is 180° rotated) .. and i'm thinking that the issue is related to the
screen resolution , that maybe is reported .. 1920X2160 (1920X1080+1920X1080) ...

just asking if someone has this behaviour using a single screen...

Confirmed. I opened issue: https://invent.kde.org/kde/kdenlive/issues/163

seems a simple fix but there is no feedback on gitlab.