Canon EOS 80D - Manual (Page 443)

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3 Registering My MenuN
You can delete all My Menu tabs or all
My Menu items you created.
 Delete all My Menu tabs
You can delete all My Menu tabs you created. When you select
[Delete all My Menu tabs], all the tabs from [MY MENU1] to [MY
MENU5] will be deleted and the [9] tab will revert to its default.
 Delete all items
You can delete all the items registered under the [MY MENU1] to
[MY MENU5] tabs and keep the tabs. The menu tab(s) will remain.
When [Delete all items] is selected, all the items registered under
all the created tabs will be deleted.
Deleting All My Menu Tabs / Deleting All Items
If you perform [Delete tab] or [Delete all My Menu tabs], tab names
renamed with [Rename tab] will also be deleted.