thank you Bjorn.
I did it sometimes ago... but today this trick wasn't in my mind..
(I never added the duplicate icons so it is a mystery for me how it was possible..)
No problem Gianni,
Solidworks does mysterious things sometimes. I recommend getting everything the way you like it the using the copy settings wizard (one of the tools installed with solidworks) to make a copy of your settings. Then when things go a bit crazy you can simply restore your settings. I do a new copy every few months to capture any tweaks that may have occurred.