Modeling Tool lacks options compared to QtCreator5

When we compare how the Class properties of a Class of a class diagram of a model look like in Qtc5 an Qtc6 (see attached screenshots of the same model opened in QtC 5.0.1 and in QtC 6.0.0): then we see that many options are missing.

I was desperately looking for the "Show members" checkbox. I finally found it, but I had to dig into a previous QtC version.

The expected result is: the properties of the class would have the same features in QtC6 as they had in QtC5.