@p.colbert: Thank you very much for your fast reply!
At first I didn’t want to believe it. 
Here I see the three clickable dots.
But in the following post, where I wanted to mark Stucorks’s answer as the solution, I can’t find this option?!
Link: Error in Example: Admin Dashboard Template
Here is the screenshot:
Why can’t I see the three dots here?
Thank you for your help!