Choose a good prefix that is the same for all of your libraries. If you want them to be at the top then use “00” as the first two characters of your prefix.
Currently, the only way is the kludge that Rene suggested. I have two wishlist items (one for schematic symbol library lists and the other for pcb footprint library lists) in the bug tracker to deal with this. If you have a launchpad login you can vote them up.
I would not really call it a kludge to be honest. Using numbered prefixes is quite common for all sorts of things. The field of mechanical engineering for example uses drawing numbers with “naming” schemes that basically make use of the fact that file browsers support sorting by file names.
I agree with you , but I think It also would be great If I can sort libraries by myself.
If there are some options for this, more people can use it according to their tendency.
but It does not mean that my opinion is better.
I do not disagree that it would be nice to have. I just think it is very low on the priority. (Easy well used workaround available. Would need massive changes to the underlying library management system to be implemented.)