What does enabling read-only formulas restrict in planning accounts?

Enabling read-only formulas in planning accounts specifically restricts data entry across all account levels. This means that while users can view the formulas and the results that those formulas produce, they cannot interact with or change the data that feeds into those formulas. This is particularly important in a collaborative planning environment, where maintaining the integrity and consistency of data is crucial. By preventing data entry in those accounts, organizations can ensure that calculations governed by the formulas remain accurate and reflect the intended planning logic without unauthorized alterations.

The other options focus on different aspects of account functionalities, which are not directly related to the read-only status of formulas. For example, user visibility of historical data is more about the accessibility of past records rather than live data input restrictions. Similarly, the ability to modify shared formulas relates to the overarching permissions and settings surrounding the formulas rather than the actual data entry within the accounts. Changes to account settings would involve adjusting configurations and does not apply to the concept of read-only formulas.