Hi,
thanks for the quick answers. Well, I thought maybe there's a way to show only columns in the sort button, which are also visible in the Book-List-View. There everyone can decide for themselves which column they want to hide and which they don't. The View Manager has no effect on the the lenght of the list in the sort button on Cover grid view -.-
I'm more of a visual type and I really really like calibres Cover grid view. Normally I only use standards like author, title, series, modified or date. But from time to time I also have my own as #read, #notRead, #writtenReviews, #onDevice, #bookStatus, #readingProgress. I never sort for example by publisher or price, pages, bookTyp (eBook, eMagazine, Paperbook). It's nice to know those things and have them written into each meta, but I don't really need them to manage my books...
It's just that mine is a pretty long list, but if changes pose more problems than use, I can live with this long list