Two automatic rules can change the status when you save or open a proposal:

• If a proposal already has payments and you change its line items so the subtotal differs, Sprwt sets it to Partially Paid unconditionally (the customer now owes a different balance) — the change is logged.
• Whenever a Signed and Approved or Partially Paid proposal is opened, Sprwt compares the total with the payments on file: fully covered → Fully Paid (and a fully-paid notice email is sent to your own business email, not the customer), partly covered → Partially Paid, no payments → Signed and Approved.

If you need a different status (e.g. Completed), set it in Payment Options > Status after the totals are final.