In PrestaShop, you can delete the default sample data by following these steps:
Log in to the back office of your PrestaShop site.
Go to the “Advanced Parameters” menu, and then select “SQL Manager” from the sub-menu.
In the “SQL Manager” section, you will find a “Delete default data” button.
Click on the “Delete default data” button, this will remove the default sample data from your store.
Alternatively, you can also delete the sample data by running a SQL query to delete the data from the database.
Log in to your hosting control panel and open the database management tool (e.g., phpMyAdmin).
Select the database for your PrestaShop site.
Find the tables that contain the sample data (usually prefixed with “ps_” or “prefix_”).
Delete the data from these tables by clicking on the “Delete” button.
Note: Keep in mind that deleting sample data can not be undone, so make sure to backup your store before proceeding.
Also, this process may affect the functionality of some modules, so make sure to check the site after the process and make any necessary adjustments.