Since Combining the Quest log with the World Map, there is no way to quickly collapse all zones/categories in the quest list without a script. This simple addon adds a button to the World map above the quest log that collapses all zones in the list for better visibility of the quests you want to see.
10/26/2022-Got some help with professions buttons. Collapse and expand buttons restored for Tradeskill/Professions windows. Buttons have been moved closer to the Recipe List instead of top right corner of overall frame.
10/25/2022-Removed Collapse/Expand buttons for Tradeskill window. API has changed alot with Dragonflights UI updates and this got broken. Working on a fix but not ready yet.
11/18/2020-Disabled the slash command and right-click drag. they were causing the buttons to show in wierd places (not where they were dragged previously)
Added Expand button for Questlog and Tradeskill window. Will combine these as a toggled button when (if?) i can.
1/27/2020 :: Added Collapse button for the Tradeskill window. Works the same as with the Quest Log. Seems to work with primary and secondary professions.
7/25/2018 :: The button has been moved to the QuestScrollFrame instead of WorldMapFrame. This way it won't be needlessly shown when the map is maximized, only in the small map mode with the quest log open. The button has been made draggable, Right-click on the button and drag it wherever you like. Also added a slash command to reset in case it gets lost off screen or behind another part of the UI, use /cqlreset to put it back to the default position.