To remove the last cover on the top that is left, unscrew right bottom corner of the middle cover. Unscrew left top corner of the middle cover and lift bottom corner as shown in the second picture. Also in the inner part are two screws hidden. One is assigned with the circle and can be seen. The other one is hidden.

When we wanted to take off the cover, there was one screw that we did not see. It was impossible to reach it. We broke off a part of the plastic.