to remove permanently.
two files for this.
/home/frappe/frappe-bench/apps/erpnext/erpnext/public/js/conf.js remove links and change links according to your requirement
another file is
/home/frappe/frappe-bench/apps/erpnext/erpnext/public/js/help_links.js
if you want to add a new menu in help links in your custom doc
create help_links.js in public js folder of your custom doc
frappe.provide('frappe.help.help_links');
const docsUrl = 'https://erpnext.com/docs/';
frappe.help.help_links['List/Property Sales'] = [
{ label: 'Video Tutorial', url: docsUrl + '#' },
]
frappe.help.help_links['Form/Property Sales'] = [
{ label: 'Video Tutorial', url: docsUrl + '#' },
]
add add this help_link.js in your custom doc hook
app_include_js = "/assets/property_sales/js/help_links.js"
if still any issue contact me : pratikcws@gmail.com