Hi BetterRed,
I tried the "View Manager"-Plugin. For the first it works for me fine. Thank you!
My next lesson will be the "virtual libraries"! I have to read a tutorial/wiki/forum to understand how it works, and the addition to the ViewManager.
As long as I can't change "Author" to "Composer", I'm fine with "author", it's almost the same

.
Probably you have a link to the virtual library tutorials, where it will be clear understandable to me...
For sure I made columns, but virtual libraries based on the role column I have to understand first... Since I have all the sheets in a different library, ViewManager works fine!
THANK YOU!!!
Tozz