You can delete the category by following the below-mentioned steps:
Go to the Menu on the extreme left
Click on the 4th icon in the Menu list “Inventory”
Click on “Categories” section
You will be landed on the Category Manager Page
Under delete title, move the cursor and click on the little dustbin shown next to the category you want to delete. The selected category will be deleted right away then.
Delete Multiple Categories Option
If you want to delete more than 1 category in one go, you will require to tick mark the check box on the extreme left near the Image.
Once you select multiple categories, go to the “Action” option on the top bar →
Click on “Delete categories”.