QB Issue Resolution:

Total of this sale, Payments/Credit applied, and Balance Due are already ON your screen, bottom right corner.

Customer Total balance is their AR balance; seen on the right of an invoice, in the side panel; seen in Customer Center; seen in AR reports, etc.

Resolution for Issue 'Some fields designed only for printed forms? Screen check boxs are grayed out. Need Payments/Credits & Customer Total Balance Due on SCREEN. WHY IS THIS NOT AN OPTION?' available: Yes (Solved).
Source: Intuit Community forum.

Some fields designed only for printed forms? Screen check boxs are grayed out. Need Payments/Credits & Customer Total Balance Due on SCREEN. WHY IS THIS NOT AN OPTION?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for and Balance Due
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Error Recovery for and Balance Due [Canada]
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