Layout not correctly shown in 4k portrait

Player Version

1.8R6

Issue

I had the player running perfectly on a 4k Layout in landscape.
Now i created a 4k-Portrait-Layout and set up the display on the pc accordingly , but the layout is not shown as in the designer at all
Line-Breaks, fullscreen not working correctly etc. etc.

Any ideas what this could be ?

Addon informations: the Taskbar (automatically NOT shown in landcape when the player started) and the top line (Date and Icons) are “always on” now …