In any space you can go to the archive and see a list of all the cards that have been archived on the boards in that space. That is, if you archive a card, it will not take up space on your boards, but all information about it will be saved.
You can have these cards automatically archived after a certain period of time:
Completed cards from the "Done" column;
Hanging and irrelevant cards from the "Queue" column.
❗️Blocked cards and cards with public access are not archived.
How to do it?
Click on the three dots next to the column name;
Enable auto-archiving;
Select the period of time the card is in the column, after which it will go to archive.