You may need to review your settings in the Accounting module in the Setup Panel to see/use all these options.

In the Accounting Panel, Supplier Payment is where you can:

There are three tabs in Supplier Payments:

You can search in each tab to find the correct invoice(s).

In Pending Payments, you'll be able to see Suppliers in the dropdown box IF they have outstanding/unpaid invoices. Similarly, you'll only see Suppliers in the search dropdown in the Paid tab if you've paid their invoice; and in the All tab if they have either a pending invoice or a paid invoice. [Otherwise, the Supplier Search dropdown will be blank.]

Clicking on the View button in any tab will display the actual invoice.

Read more about Supplier Invoice Management.

To record a supplier payment, in the Pending Payment screen, review how much is outstanding and how much is in the Payment field, and make any adjustments required.

[Note - If you've enabled supplier invoice approvals in your Accounting Module setup, you'll only see approved supplier invoices here. To approve an invoice, you need to go use the Supplier Invoice Management screen.]

Enter the Payment details (date, Bank Account, payment reference and amount) and save.

You should now be able to find the paid supplier invoice in the Paid and All tabs here (and in the Supplier Audit Trail).