This tutorial shows how to delete a menu in Drupal 7.x.
From Drupal Admin Panel, navigate to Structure/Menus:
Next to the menu you want to delete, click Edit menu :
Click ‘Delete’ button:
On the appeared screen this click ‘Delete‘:
Refresh your site to check the changes.
Note: Default menus cannot be deleted. There is no option to remove them:
Feel free to check the detailed video tutorial below: