your answer let me think that there is a little missunderstanding. I hadn’t asked for sorting Options.
The list is already sortet in Razuna with this built in functionality as you can see in the upper picture. It is just that the Gallery-Widget is sorting the Assets to its own like instead of using the existing order.
In my opinion the actual behaviour is a bug or at least a not fully implemented functionality. Otherwise, why would I have the possibility of sorting my assets in a Collection, if it is never used?
If I had the faintest idea of the Razuna Code, I would fix this by my self. Thinking of an SQL-Select it would be just to switch the sorting column. Hopefully this will be corrected in the next Version.