quest chain, could ignore any filters such as account mode or others such as threads of fate and show character only, I understand that you do not want to use quests collected by alts in the quest chain, but it is complicated without using quests collected by alts when you use account mode and will see all the Dracthyr quests together on a Hunter quest chain, or threads of fate on a character who did not make the threads of fate, or even another covenant.

just a suggestion or something like that, thanks guys and congratulations for the great/hard work you've been doing.
ps english is not my main language

Quest Chain popouts currently ignore Account-Wide collection and force Quests to be treated as Collectible, but it's true no other filters are modified and thus sometimes there are more quests visible than the current character can complete. It would be nice to have the 'simplest' layout of a Quest chain for a given character, instead of needing to change settings every time to see proper quest lines.
But I don't think I want to just change the default functionality, since there are situations where (at least for debugging) it's nice to see all possible routes of a quest chain in one window, so it would be nice to have some way of maintaining the existing functionality where the filters apply to the quest chain window.
Will have to put this on the list and think about the best way to adjust this in the future.