As part of the data form design, the majority of the dimensions on the form that do not require changes are hidden. For example, the ICP, View, and Value dimensions are almost always hidden. The TaxType dimension is configured in the form definition and in most cases is not seen by the user. You can hide any dimension from users for simplification.
Most data forms have a layout of Accounts in the rows and RollForward members in the columns. The specific layout of the dimensions is included in each form section. See Data Form Names and Descriptions.