Is it true that no matter which time column you open, the volume calculation icon will show all volume up to the current minute?

The statement that the volume calculation icon reflects volume only for that specific time column is accurate. In most data visualization and reporting tools, including those utilized in Epic systems, the volume calculation icon functions based on the specific time period represented in the column you are viewing. Thus, when you open a particular time column, the volume displayed corresponds solely to that timeframe, rather than aggregating volume data from all columns irrespective of their time frames. This design allows users to analyze performance and volume metrics with granularity, helping to understand trends and specific periods of activity without confusion caused by data from other times.