Magento 2: How to reset filters in product grid?

The filter settings are stored in ui_bookmark table. It has the following columns:

• bookmark_id,
• user_id,
• namespace,
• identifier,
• current,
• title,
• config,
• created_at,
• updated_at

You can delete the row with your user_id, or just truncate that table.

Alternatively you can use https://github.com/magenizr/Magenizr_ResetUiBookmarks which does exactly the same what you have explained above. This module will add a reset button on the Account Settings page in the backend. Once you hit the Reset UI Bookmarks button, it will delete all records from ui_bookmark based on the current user_id.