The columns you see depend on the columns you display or hide.
Group by Category
Groups history messages into categories. The available categories depend on the messages currently in System History, but can include Job Settings, Storage, and so on.
Use this list to filter the date range of history messages shown in the System History window.
A short description of the action taken. For each action, the description includes a number at the end of the text indicating the number of detail items listed for that action. You can expand an action to view its details.
The logon name of the user who initiated the action.
The date and time that the action or process was initiated.
Indicates whether the message is for information only, or is an error or warning.