If you want to remove WordPress category then follow this instruction:
1. Login to your WordPress admin dashboard.
2. Under the dashboard menu, hover your mouse on Posts and then click on „Categories„.
3. On the right side you can see a list of categories. Hover your mouse on a category you wish to remove and a few options will appear. Click on the „Delete“ option. The confirmation option will appear. Click on „OK„.
How to remove a category in WordPress?