Okay I found it. I have to set the sync adapter visible:
android:userVisible="true"
Question
I have problems with the settings for a sync adapter / authenticator. I can add CheckBoxPreferences, SwitchPreferences and PreferenceScreens but I don't know how to set up the settings for the accounts sync :-( When I tap on the sync entry I see this screen on the right side. But I want a screen where I can switch the sync on and off... like the account setting from my Google account.
How to do that?
Solution
Okay I found it. I have to set the sync adapter visible:
android:userVisible="true"