Hi @nimesh8063,
When we tried trashing more than 4 product at a time it leads to 404 Page. We tried resetting permalink but didn’t work.
I am able to trash more than 4 items after moving to the Trash and clicking Empty Trash
as seen here. I have created many products to test this, and also deleted some old products that I have had in testing for some time.
As I am not able to replicate this, are you still having the issue? Please test, and if you are it could be a plugin conflict. The easiest way to test this is queue up more than 4 items in the trash, then disable all of your plugins except WooCommerce, then go back and click the Empty Trash
option.
If it works, then re-add your plugins a few at a time, testing after each activation. That should find the issue.