Which feature is used to reverse previous changes made to an image or shape in graphics editing software?

The correct feature used to reverse previous changes made to an image or shape in graphics editing software is the "Undo" command. This function allows users to step back through their previous actions and restore a previous state of the image or shape.

The "Undo" command is commonly accessed through a keyboard shortcut (such as Ctrl + Z on Windows or Command + Z on Mac) and is essential for correcting mistakes or trying different editing techniques without permanently altering the original work.

The "History" panel, while useful, serves a different purpose; it allows users to view and navigate through a list of all the actions taken during a session, enabling them to go back multiple steps. However, it isn't the direct command to undo a single action.

The "Redo" feature, on the other hand, is used to reapply an action that was undone, preserving the sequence of edits. Lastly, "Revert" typically refers to restoring the entire project to its last saved state, which is broader than undoing specific changes. Each of these tools has its place in graphics editing, but the act of reversing a single action is most aptly described by the "Undo" feature.