Does anyone know how to change Paid (not deposited) invoices into Paid (deposited). Payments were received via check and deposited.

Glad to see you here in the Community, @contact41.

When receiving payment in QuickBooks Online, if you chose to deposit the payments under the Undeposited funds account then this is the reason why the status of your invoice was showing as paid but not deposited.

To change the status to deposited, then you may need to do Bank Deposit. 

Here’s how:

1. Go to the + New icon at the left pane.
2. Hit Bank deposit under Others column.
3. On the Account drop-down, select the bank account you wish to deposit the payments.
4. In the Received from column, select the invoices by putting a checkmark on the box.
5. Then, click Save and close.

Please see the sample snips below for reference:

Once done, go back to the Invoices page, and the status will now change into Deposited.

Also, here are some helpful articles that you can check on for future reference about receiving invoice payment in QuickBooks Online:

• Record customer payment in QuickBooks Online
• Bank Deposits

Just leave a comment below if you have any additional questions. I'm always here to help. Take care!