合并企业版代码(未测试，先提交到测试分支)

web_enterprise/static/src/views/pivot/pivot_renderer.js

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+/** @odoo-module */
+
+import { patch } from "@web/core/utils/patch";
+import { PivotRenderer } from "@web/views/pivot/pivot_renderer";
+
+const { useEffect, useRef } = owl;
+
+patch(PivotRenderer.prototype, "web_enterprise.PivotRendererMobile", {
+    setup() {
+        this._super();
+        this.root = useRef("root");
+        if (this.env.isSmall) {
+            useEffect(() => {
+                const tooltipElems = this.root.el.querySelectorAll("*[data-tooltip]");
+                for (const el of tooltipElems) {
+                    el.removeAttribute("data-tooltip");
+                    el.removeAttribute("data-tooltip-position");
+                }
+            });
+        }
+    },
+
+    getPadding(cell) {
+        if (this.env.isSmall) {
+            return 5 + cell.indent * 5;
+        }
+        return this._super(...arguments);
+    },
+});

web_enterprise/static/src/views/pivot/pivot_renderer.scss

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+@include media-breakpoint-down(md) {
+    .o_pivot {
+        height: 100%;
+
+        .dropdown.show {
+            > .dropdown-toggle::after {
+                @include o-caret-down;
+            }
+        }
+
+        th > .o_group_by_menu  > .dropdown-menu {
+            .dropdown-item {
+                // caret centered vertically
+                .dropdown-toggle::after{
+                    top: 12px;
+                }
+
+                // nested dropdown should be *under* the parent, not on its side
+                .dropdown-menu {
+                    top: initial !important;
+                    left: 5% !important;
+                    width: 95%;
+                }
+            }
+        }
+    }
+}

web_enterprise/static/src/views/pivot/pivot_renderer.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<templates xml:space="preserve">
+
+    <t t-inherit="web.PivotRenderer" t-inherit-mode="extension">
+        <xpath expr="//div[hasclass('o_pivot')]" position="attributes">
+            <attribute name="t-ref">root</attribute>
+        </xpath>
+    </t>
+
+</templates>