Canon EOS REBEL T7i Instruction Manual page 402

3 Registering My MenuN
Deleting All My Menu Tabs / Deleting All Items
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. The tab(s) will remain. When [Delete all items] is
selected, all the items registered under all the created tabs will be
deleted.
If you perform [Delete tab] or [Delete all My Menu tabs], tab names
renamed with [Rename tab] will also be deleted.
402
You can delete all the created My Menu
tabs or My Menu items registered under
them.