New HP Pavilion Desktop TP01-2050nl.

The monitor is connected through the HDMI cable.

Every now and then KDE pops-up rather huge rectangle in the middle of the screen. It shows four images each one with two monitors, either close to each other, or separated or different, red arrows and texts like "Switch to laptop", "Switch to external", ...., and the most right image is a huge circle with a dash. Clicking the last removes the rectangle. The rectangle removes itself after about 10-20 secs.

What is the idea. Special because one or more of the images talks about "laptop". And of course, how to get rid of it for good. And maybe file a bug with KDE when I understand more of this phenomenon.