diff --git a/addons/mail/static/tests/helpers/patch_ui_size.js b/addons/mail/static/tests/helpers/patch_ui_size.js
index 46f4c984651..a141e3da468 100644
--- a/addons/mail/static/tests/helpers/patch_ui_size.js
+++ b/addons/mail/static/tests/helpers/patch_ui_size.js
@@ -3,7 +3,6 @@
 import { browser } from "@web/core/browser/browser";
 import { MEDIAS_BREAKPOINTS, SIZES, utils } from "@web/core/ui/ui_service";
 import { patchWithCleanup } from "@web/../tests/helpers/utils";
-import { Component } from "@odoo/owl";
 
 /**
  * Return the width corresponding to the given size. If an upper and lower bound
@@ -37,25 +36,6 @@ function getSizeFromWidth(width) {
     });
 }
 
-/**
- * Patch legacy objects referring to the ui size. This function must be removed
- * when the wowl env will be available in the form_renderer (currently the form
- * renderer relies on config). This will impact env.browser.innerWidth.
- *
- * @param {number} size
- * @param {number} width
- */
-function legacyPatchUiSize(height, width) {
-    const legacyEnv = Component.env;
-    patchWithCleanup(legacyEnv, {
-        browser: {
-            ...legacyEnv.browser,
-            innerWidth: width,
-            innerHeight: height || browser.innerHeight,
-        },
-    });
-}
-
 /**
  * Adjust ui size either from given size (mapped to window breakpoints) or
  * width. This will impact uiService.{isSmall/size}, (wowl/legacy)
@@ -83,7 +63,6 @@ function patchUiSize({ height, size, width }) {
             return size;
         },
     });
-    legacyPatchUiSize(height, width);
 }
 
 export { patchUiSize, SIZES };