A confidence score can help organize review, but it does not answer whether an output is appropriate to release. Before using one, determine what the score measures, which fields have scores, and how it behaves on your documents.
Microsoft's Document Intelligence guidance distinguishes estimated accuracy from analysis confidence and separates document, field, word, and other confidence measures; it also notes that not all fields return confidence scores (Microsoft documentation). These definitions describe that product, not every application that displays a percentage.