By default, the Edit toolbar provides quick access to common editing commands like Copy and Paste. Tools commonly found on this toolbar are described below. For a complete list of tools that can be placed on a toolbar and more information about customizing them, see Tools and Toolbars.
If the toolbar is currently hidden, go to Tools > Toolbars and select it to show it.
Format Painter (CTRL+SHIFT+C): Copies appearance formatting and properties from one markup to another markup or group of markups.
Delete (DEL): Deletes the selected markup.
Flatten (CTRL+SHIFT+M): Flattens markups in the current document, moving them from the markup stream into the main body of the PDF, rendering them uneditable.