Why the filter is already applied

[NCP]

Reference:

Add Custom Script to all DocTypes

Yes, you can. Add and build a js script with below codes in public js folder of your application : $(document).on('app_ready', function() { $.each(["Opportunity", "Quotation", "Supplier Quotation", "Sales Invoice", "Delivery Note", "Sales Order", "Purchase Invoice", "Purchase Receipt", "Purchase Order"], function(i, doctype) { frappe.ui.form.on(doctype, "setup", function(frm) { // code for setup event }); frappe.ui.form.on(doctype, "refresh", function(frm) { …

Something like this scenario will happen.
This reference for doctype script, not for the listview.