Hi @ClemensRobbenhaar! Thanks for the detailed answer.
Got it. But what I’m pursuing now is to control the visibility of the whole menu itself. I can control “Menu” Application scope by using the “Menu visibility scope” property available at the concerned tab under “Administer Wiki”. But this is not possible for “Top Panel Menu” to the best of my current understanding. At least in the XWiki instance I’m using now (XWiki Debian 16.5.0) “Top Panel Menu” is available only for logged users, not for anonymous ones. You won’t see the top menu if you go now to https://portal.igfae.usc.es. I can see it when loggged:

I don’t know how to control its visibility: I would like to show this simple top menu to all users, anonymous included. Could you help me with this?
Nice. As I’m looking for a very simple top menu, it won’t be hard to change the links so far. It will be also a nice exercise to design a simple counter to hide empty tabs! I will work on that!
Thanks!