It may happen that only 3 days of historical data is available in Building Operator.
By default, it is possible to look back 3 days of historical data in Building Operator. If you want to look back further than 3 days, the project needs a Cloud History license.
With a Cloud History license, historical data points can be marked via TC Engineer, TC Operator (via TC History Connect). When the points in question are marked as historical data points, the historical data will be available for viewing in Building Operator.