My Norwegian is a little rusty, but I believe the question is "RX100 III Does not change the selfie screen".
This is a problem reported on other sites, and people have said that when the RX100 is working properly the image stays upside-down until the lcd frame is pressed flat against the back of the camera. If something prevents that full movement (like a screen protector in the way) the image will stay inverted, so make sure that the screen is pushed fully into place. I also saw mention of the possible misalignment of a position-sensing magnet in the flip screen, although that was for a similar problem on a different camera.
-R