Each event in a simulation session is recorded in a scenario. The simulation history is the set of scenarios obtained from simulation.
Scenarios can not be edited in the simulation history viewer. They may however be moved to the scenario model edition tool.
Left-clicking on a line in the history viewer, then right-clicking, brings a menu which allows moving the selected scenario to the scenario model edition tool. Once moved, a scenario can be subject to all the editing operations supported by the scenario model edition tool.