Click the 
button on the quick access toolbar of the ribbon.
To undo the last operation with the object:
Click the button on the quick access toolbar of the ribbon.
Press CTRL+Z.
To redo the last undone operation:
Click the 
button on the quick access toolbar of the ribbon.
Press CTRL+Y.
NOTE. If the and buttons are not displayed on the quick access toolbar of the ribbon, toolbar setup: add the Redo and Undo items from the Home category.
Constraints on undoing or redoing operations in the web application:
On working with text, operations are undone or redone as it is allowed by browser built-in means.
Visualizer settings are undone or redone at once for all settings determined after changing the focus and moving to the configured visualizer.
See also: