Solved
In the list of items to add to an activity there's Notes. However clicking on it doen't give any reaction. I can add a GG applet to an activity and when choosing the option to make a new applet I can select notes, that's true. But Notes is presented as a seperate option in the list of items too. It looks there's something wrong.
The same problem 
OK for me here https://www.geogebra.org/wo...
Which browser?
Yes, OK now also for me!
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