You can remove, or drop, existing tables from a database. This is usually recommended before importing a new database or restoring a backup.

Warning: Before dropping your database tables, ensure that you have a backup of the database.

Log into phpMyAdmin. Check this article: https://help.tsohost.com/knowledge-base/article/11999

You should see a list of all your database tables.

Check the Check All box.

Note: You can drop specific tables by checking individual boxes next to the table names.

From the drop-down next to the Check All box, select Drop.

Click Yes, when prompted with "Do you really want to execute the following query?"

Click Yes to drop the tables.