You can remove it from the database. I will provide examples using Magerun2.
1 - Admin user
Access your database and list the admin users, and find your admin user ID there.
magerun admin:user:list
2 - Find the data
Run this command below to enter into the DB.
magerun db:console
Then get the list of UI Bookmarks that you have saved in the DB using this command.
SELECT 'namespace' FROM ui_bookmark;
3 - Remove it
Then remove the data saved to the product grid according to your admin user ID, my admin user ID is 3 so I ran these commands below.
DELETE FROM ui_bookmark WHERE user_id='3' AND namespace='product_listing';
DELETE FROM ui_bookmark WHERE user_id='3' AND namespace='product_attributes_grid';