XWE unable to sort my Wad?

I've had this problem most of the time If I tried to compile a bunch of wads and try to sort it out to make it look more tidier but instead XWE just gives me an error message saying "You can only sort the list when it is filtered". I've been trying to look for a solution for this but unfortunately I didn't find any so I just decided to ask here. Is there something I missed in XWE that I could resolve this problem?

If you want to re-arrange your wad directory - select the lump/s you want to move, hold down the Ctrl key and press U to move them up the listing or D to move them down.

Yeah, that option in XWE doesn't really do anything to your WAD, it just displays things in a different order. :)