Emil:

i just want to be able to sort by highest %. would be fun to clean all of those 99% i probably have somewhere.
like at the top i see Arathi Highlands quest 99% then below that maybe BRD 98% etc
or when i log in someday it pops up "you have 2 items left to collect in Badlands!"

From discord channel

Our lists are sorted in a specific way as to avoid information getting lost. (Although despite our best efforts things still get lost due to how large the database is.)

As such, we have no plans to introduce arbitrary sorting methods that could significantly affect the performance of the addon.