In Word 2016, how can all Paragraph Numbering be deleted all at once?

The numbering above was generated via Home > Paragraph > Numbering or Multilevel List (I caot remember which).

This comment suggests my fault in failing to number correctly; so I am trying to delete all numbers simultaneously before I select Multilevel List this time.

Per the screenshot above:

1. when I right-click on the numbering, the Cut option has already been faded and caot be clicked.

2. left-clicking the numbering tus it grey, but pressing Delete on my keyboard deletes only 1. Inefficiently and agonisingly, I had to repeat pressing Delete to delete each number.