Hi @smartioleb
Are you referring to the Marketing > Coupons on the menu located on the dashboard menu?
If yes, then you’ll have to disable this feature on WooCommerce. Since this is also a part of the core functions of the WooCommerce plugin. Kindly navigate to WooCommerce > Settings > General > Enable Coupons and disable Enable the use of coupon codes.
This should remove the Coupons menu on your dashboard.
Let me know if this fixes your issue.
Cheers!