You can change the Account Status assigned to the customer accounts currently displayed in the Collections Search Results window. To bulk update the account status:
Right-click anywhere in the Collections Search Results window and select Bulk Operations > Bulk Update Account Status. This displays the Bulk Update Account Status window.

Select the account status you want to assign from the drop-down list.
Click Save to assign the selected status to the customer accounts currently displayed in the Collections Search Results window. This displays a Bulk Operation Status window indicating the bulk operation completed successfully.
Click OK. This updates the Account Status column in the Collections Search Results window with the new status.