In FineReader Engine 10 and below, the property FlexiFormsDA was used to extract as many text as possible (including garbage).
In FineReader Engine 12, we recommend replacing this parameter with a following set of the parameters:
PageAnalysisParams.EnableTextExtractionMode = true;
ObjectsExtractionParams.EnableAggressiveTextExtraction = true;
ObjectsExtractionParams.DetectTextOnPictures = true;
Alternatively, use LoadPredefinedProfile("DocumentArchiving_Accuracy"). Thus you will discard all formatting and tables detection, but extract as many text items as possible.