Is your feature request related to a problem? Please describe.
Boards typically tend to have a similar setup of ToDo, Doing and Done lists. To reduce clutter and allow for better focus, users might tend to collapse the Done lists. Users might also have multiple Fixed lists on the same board, which tend to get collapsed too. Due to collaboration, other users might move or add new Done/Fixed lists to a board, meaning you have to manually collapse it each time.
Describe the solution you'd like
add Global Settings to allow user to enter specific strings for list names to collapse
or make the strings be separate for each board, however then give an option to make the collection of strings apply globally
on each board, allow to enable or disable this automatic collapsing
Describe alternatives you've considered
For a much easier alternative but with very limited functionality see #9
Additional context
How one could go about implementing this:
Trello API has a callback that allows you to get names of all lists on a board.
With those names you can check if the name includes a certain string.
If the string is found, collapse the lists.
For example:
Suppose you have the lists: Bob ToDo, Bob Doing, Bob Done, Bob Fixed
set strelloid settings to automatically collapse lists that are called "Done" & "Fixed"
→ "Bob Done" & "Bob Fixed" get collapsed
As to when to run this is up to you, I guess whenever user opens a board? When a new list with the string to collapse is being added to the board? Or whenever user changes his strelloid settings? There might be much better ways to go about this of course, you will know best.
krzmig
commented
4 years ago 
Is your feature request related to a problem? Please describe. Boards typically tend to have a similar setup of ToDo, Doing and Done lists. To reduce clutter and allow for better focus, users might tend to collapse the Done lists. Users might also have multiple Fixed lists on the same board, which tend to get collapsed too. Due to collaboration, other users might move or add new Done/Fixed lists to a board, meaning you have to manually collapse it each time.
Describe the solution you'd like
Describe alternatives you've considered For a much easier alternative but with very limited functionality see #9
Additional context How one could go about implementing this:
For example:
As to when to run this is up to you, I guess whenever user opens a board? When a new list with the string to collapse is being added to the board? Or whenever user changes his strelloid settings? There might be much better ways to go about this of course, you will know best.
Thank you for your work :-)