ok, I’m glad it works with 1.8 and de in language.
So, without XMR, after you make change to layout, resize regions / add content etc.
Your player will need to connect to the CMS and download updated content, player connects to the CMS, each collection interval, a settings that can be adjusted in Display profile options. (Display settings -> edit display profile assigned to your device -> collection interval).
Once player did that, next time your layout reloads it should display updated layout.
With XMR configured, all changes will be pretty much instant (+ time to download new content if something was added).