View and Edit Commands on History Tree Objects
The history tree lists the history of all commands carried out a model’s objects, for example, CreatePolyline or Unite. This history is displayed in the order in which it occurred. Here is a history tree from the waveguide combiner example:
Selecting a command in the history highlights the object in the Modeler window and shows that object’s properties (if available) in the docked Properties window. You can look at the fields in the Properties window to see any editable fields for that command, such as coordinate system, line type, coordinates, or units.
For some commands, such as Edit > Arrange > Move, or Boolean operations, selecting them in the history tree enables the X (Delete) icon on the ribbons and the Edit > Delete menu. In these cases, you can delete those commands from the history tree as a way of undoing those operations. As an alternative to deletion, you can check Suppress command in the Properties window for that command. This undoes the effect of a command on an object without removing it from the history tree.