You can not remove the Uncategorized category, but you can rename it.
- Login to your WordPress admin dashboard.
- Under the dashboard menu, hover your mouse on Posts and then click on Categories.
- On the right side, you can see the Uncategorized category option. Please hover your mouse on it, and a few options will appear. Click on the Quick Edit option.
- Change the name and slug and then click on the Update Category option.