How Can I Customize and Edit this Dashboard in Item Doctype

ERPNext Customize ERPNext
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2

If you want to remove the Pricing Rule link then check the syntax.

frappe.ui.form.on('Item', {
    refresh: function(frm) {
        $('div[data-doctype="Pricing Rule"]').hide();
    }
});

Please check it: [HELP] How to Customize (hide) "+" add button in section Connection (Linked Documents) - #3 by NCP