Score editor "Activate Arranger Track" button is not working

I feel like this is a bug with the new Cubase 11, but I might be wrong. I’m trying to follow this part of the manual:
I’m trying to click on the button to “Activate Arranger Mode” but when I release the mouse it goes back into being inactive.
I have a simple project with one instrument track and one repeat sign after two bars.


I can confirm.

Reported to Steinberg. Thank you.

Pending a fix, in order to workaround this bug, make sure that your score is not opened in its window and in the lower zone at the same time.

(through the help of @steve and @Martin.Jirsak :wink: )