Let's examine the History panel in Adobe Photoshop.
First, you need to learn how to open the History panel in the program — go to the menu Windows-HistoryWindow-History.

Now let's go to the settings of the panel itself (there is a menu on the right side).
Let's go through all the items in order:
1.Step Forward (Shift+Ctrl+Z)Step Forward (Shift+Ctrl+Z) — applies the next user action/step.
2.Step Backward (Alt+Ctrl+Z)Step Backward (Alt+Ctrl+Z) — returns to the previous user action/step.
3.New SnapshotNew Snapshot — takes a copy of the current image.
4.DeleteDelete — intended for deleting a snapshot copy or a history step.
5.Clear HistoryClear History — clears the list of user actions on the History panel.
6.New DocumentNew Document — creates a new document with the user's changes applied.
7.History optionsHistory Panel Options — a window with settings for the History panel.


7.1.Automatically Create First SnapshotAutomatically Create First Snapshot — automatically creates a new snapshot when the document is opened.
7.2.Automatically Create New Snapshot When SavingAutomatically Create New Snapshot When Saving — automatically creates a new snapshot when the document is saved.
7.3.Allow Non-Linear HistoryAllow Non-Linear History — changes between the current action and the last one are not erased.
7.4.Show New Snapshot Dialog by DefaultShow New Snapshot Dialog by Default — intended to display the new snapshot dialog by default.
7.5.Make Layer Visibility Changes UndoableMake Layer Visibility Changes Undoable — saves layer opacity settings for subsequent changes.
8.CloseClose — closes the History panel.
9.Close Tab GroupClose Tab Group — closes a group of panels.
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