How to comment some code in PyCharm using Swiss/German keyboard?

I am trying to learn Python using PyCharm and my Swiss/German keyboard. The usual shortcut to comment some code (line or block) is + / which should become + + 7 on a Swiss/German keyboard since one must press + 7 to obtain the symbol /.

But here is the problem: Pressing + + 7 just opens the Help tab in the top bar on my Mac. Looking around to resolve this issue, I found two different advice that do not work:

  • Some advise to change the shortcut for commenting in “PyCharm > Settings > Keymap.” After multiple tries, adding new custom shortcuts doesn’t change anything : either the shortcut already exists for something else, or I can add it but it doesn’t do anything. I have tried to add shortcuts like + è or + ¨ but somehow those shortcuts don’t do anything once I click OK
  • Some others advise to change keyboard and use a US one… This is ridiculous, there must be a more reasonable solution. Please help me !

By the way, in the list of keyword shortcuts, why are there two different Comment Actions namely “Comment with Line Comment” and “Comment with Block Comment?” Are they really different actions ? I don’t understand the difference.