You can lock 
a fund when you want to keep it active but don’t want to see it in your funds list. This can be useful for seasonal funds like Christmas or birthdays. Locked funds still receive weekly contributions but are not available to select when reviewing bank transactions. Locked funds can be shown by tapping Filter & sort and selecting Show locked.
You can archive 
a fund when you’re done with it. This will stop the weekly contributions and the fund will not be visible unless you select Show archived from the Filter & sort options.
For a full breakdown on locking and archiving funds, please read our knowledge base article Locked and Archived Funds