Log into the Admin Panel as an administrator. You can find instructions in our FAQ article "How can I log in to the Admin-Panel (web interface of the filter)?".
Click on "General" > "Mailboxes configuration" and switch to the tab "Mailboxes".
Select "Show results" to display all mailboxes.
Click on the drop-down menu for the desired mailbox and select "Edit".
Now expand the menu item "Archiving enabled" and select the option "No" to disable archiving for this address.
Click on "Save" to save the change.