One you receive all required materials from the applicant, you want to mark his submission as "Materials Received" to have this question closed for them and for you. Below are the steps to do that.
STEP 1: Navigate to Bulk Edit Complete
When in program management window, go to Entries drop-down
Select the Bulk Edit Complete option
STEP 2: Set Materials Received option to Yes
Find the application you want to mark the receipt of materials
Unfold the drop-down under Materials Received folder next to the target entry
Select Yes
Click Save All one you marked all entries you wanted.