After a layout has been saved, you can rename it at any time if you wish to do so.
From the Customise/Export menu, select Rename Layout.
The following window will appear prompting you to select a layout and
enter a new name.
Once you have selected the desired layout and typed in its new name, click the Confirm button.
See Also:
Creating a layout - Show/Hide Grid Columns
How to Save a Layout
How to Rename a Layout
How to Delete a Layout
How to Select a Layout