A custom appendix can be renamed by hovering the mouse over the name of the appendix; this will prompt a ‘Rename’ button to appear to the right of the appendix title. This is displayed in the screen capture below.
When the 'Rename' button is clicked, this will provide the option to update the name of the custom appendix within a text box.
The changes can be accepted by clicking on the green tick box or cancelled by clicking on the red cross box.
Please note that this is only an option for a published custom appendix; it is not possible to rename a custom appendix that has been saved as a draft.