If you want to tidy up your boards dashboard without permanently deleting your boards, you can archive them instead. This puts them in an archived folder away from your other boards.
Archive a board
1. Click the ‘…’ icon below the board you want to archive
2. Hit the bin icon
3. Choose ‘Archive’ when the dialogue box pops up
Restore or permanently delete a board
Click ‘All Boards’ at the left side of the main boards dashboard
Choose either ‘Restore’ or ‘Delete’