It seems that the Available styles -setting is not honored. Even though I have just one available style selected (and forced) for a site, users can view other styles as well in the settings.
The forced style (for example style A) is still applied, but user is still able to select other styles (B, C). If style B is selected, it shows up under settings as active style, but style A is (correctly) being used.
The forced style (for example style A) is still applied, but user is still able to select other styles (B, C). If style B is selected, it shows up under settings as active style, but style A is (correctly) being used.