Only users who have approver access will be able to view restricted vendors and have the ability to set a vendor as restricted.
Step 1: On the left navigation click VENDORS.
Step 2: Click VIEW VENDOR PROFILE from the Actions drop down menu to the left of the vendor.
Step 3: Click EDIT.
Step 4: Uncheck the box that says "Is Vendor Public" under the vendor name.
Step 5: Click SAVE.
NOTE: All vendors that are created by an employee will be restricted by default.