Hide Childtable's row, disable checkbox

doctype.js

frappe.ui.form.on('Process File', {
    onload: function(frm) {
        frm.fields_dict['action'].grid.wrapper.find('.grid-row-check').hide();
        frm.fields_dict['action'].grid.wrapper.find('.grid-header-row .grid-row-check').parent().hide();
        
        // Disable row reordering
        frm.fields_dict['action'].grid.cannot_be_reordered = true;

        // Inject custom CSS to remove the entire checkbox column
        $("<style>")
            .prop("type", "text/css")
            .html("\
                .grid-row-check, \
                .grid-header-row .grid-row-check, \
                .grid-row .grid-row-check {\
                    display: none !important;\
                }\
                .grid-row, .grid-header-row {\
                    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));\
                }")
            .appendTo("head");
    },
    refresh: function(frm) {
        frm.fields_dict['action'].grid.wrapper.find('.grid-row-check').hide();
        frm.fields_dict['action'].grid.wrapper.find('.grid-header-row .grid-row-check').parent().hide();
    }
});