合并企业版代码(未测试，先提交到测试分支)

web_enterprise/static/src/views/list/list_controller.scss

@@ -0,0 +1,9 @@
+.o_list_renderer {
+    --ListRenderer-thead-bg-color: #{$o-view-background-color};
+    --ListRenderer-thead-border-end-color: transparent;
+
+    // Standalone list views
+    .o_list_view &  {
+        --ListRenderer-thead-padding-v: 1rem;
+    }
+}

web_enterprise/static/src/views/list/list_renderer_desktop.js

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+/** @odoo-module */
+
+import { isMobileOS } from "@web/core/browser/feature_detection";
+import { useService } from "@web/core/utils/hooks";
+import { patch } from "@web/core/utils/patch";
+import { ListRenderer } from "@web/views/list/list_renderer";
+import { PromoteStudioDialog } from "@web_enterprise/webclient/promote_studio_dialog/promote_studio_dialog";
+
+export const patchListRendererDesktop = {
+    setup() {
+        this._super(...arguments);
+        this.userService = useService("user");
+
+        const { actionId, actionType } = this.env.config;
+        const list = this.props.list;
+        this.isStudioEditable =
+            !isMobileOS() &&
+            this.userService.isSystem &&
+            actionId &&
+            actionType === "ir.actions.act_window" &&
+            list === list.model.root;
+    },
+
+    get displayOptionalFields() {
+        return this.isStudioEditable || this.getOptionalFields.length;
+    },
+
+    /**
+     * This function opens promote studio dialog
+     *
+     * @private
+     */
+    onSelectedAddCustomField() {
+        this.env.services.dialog.add(PromoteStudioDialog, {});
+    },
+};
+
+patch(ListRenderer.prototype, "web_enterprise.ListRendererDesktop", patchListRendererDesktop);

web_enterprise/static/src/views/list/list_renderer_desktop.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<templates id="template" xml:space="preserve">
+
+<t t-inherit="web.ListRenderer" t-inherit-mode="extension" owl="1">
+    <xpath expr="//Dropdown" position="inside">
+        <t t-if="isStudioEditable">
+            <div t-if="getOptionalFields.length" class="dropdown-divider"/>
+            <DropdownItem parentClosingMode="'none'" onSelected="() => this.onSelectedAddCustomField()" class="'dropdown-item-studio'">
+                <i class="fa fa-plus fa-fw me-2"/>
+                <span>Add Custom Field</span>
+            </DropdownItem>
+        </t>
+    </xpath>
+</t>
+
+</templates>