What functionality is missing? What is unsatisfying with the current situation?

I suggest a sorting or filtering interface for the Quests page. When looking at a Parties quests, it shows the Accepted and Active quests first, and if you scroll down you can see the Abandoned, Compeleted and Failed ones. There is no way to sort quests to overview them other than scrolling to try and find the most recent, abandoned, all active or all personal quests for example.  

How does this feature request address the current situation?

It would allow players and the world builder to sort through the quests, either by clicking filter checkboxes, or sorting them with specific markers such as "most recent" or something along those lines.  

What are other uses for this feature request?

It allows for easier management of quests for both players and GMs, both in and out of game.