Steps
Find the board or project you want to archive
Click the three-dot menu next to the board name
Select "Delete" or "Delete Board" from the dropdown
Confirm the Delete when prompted
The board will move to your "trash" section
Access archived boards through Project > Trash Boards
Trash boards still contain all their original content
You can unarchive them anytime by opening the Trash and selecting "Restore"
Notes
Archiving doesn't delete the board or affect its permissions
Archived boards are hidden from the main dashboard
Collaborators can still access archived boards if they have the link
Use archiving for completed projects or boards you might need later