Edit menu

• Undo: Return to the state before the previous action, shortcut Ctrl+z
• Redo: Go back to the state after the next action occurred, shortcut Ctrl+y
• Copy: After selecting an atom, you can copy it, shortcut key Ctrl+c
• Paste: Paste the copied atom to the current window, shortcut key Ctrl+v; The pasted atoms will be placed in random positions
• Delete: Delete the currently selected atom, shortcut key Delete