diff --git a/addons/web/static/src/legacy/utils.js b/addons/web/static/src/legacy/utils.js
index 49ab4cfb31b..8dd659be439 100644
--- a/addons/web/static/src/legacy/utils.js
+++ b/addons/web/static/src/legacy/utils.js
@@ -208,26 +208,6 @@ export function makeLegacyRPCService(legacyEnv) {
     };
 }
 
-export function useLegacyRefs() {
-    const env = owl.useEnv();
-
-    let legacyRefs;
-    if (env.legacyRefs) {
-        legacyRefs = env.legacyRefs;
-    } else {
-        legacyRefs = {
-            component: null,
-            widget: null,
-        };
-    }
-
-    owl.useChildSubEnv({
-        legacyRefs,
-    });
-
-    return legacyRefs;
-}
-
 /**
  * This hook allows legacy owl Components to use services coming from the wowl env.
  * @param {string} serviceName
diff --git a/addons/web/static/src/webclient/actions/action_dialog.js b/addons/web/static/src/webclient/actions/action_dialog.js
index 0ff32a1c475..126fd9f8a94 100644
--- a/addons/web/static/src/webclient/actions/action_dialog.js
+++ b/addons/web/static/src/webclient/actions/action_dialog.js
@@ -3,21 +3,10 @@
 import { Dialog } from "@web/core/dialog/dialog";
 import { DebugMenu } from "@web/core/debug/debug_menu";
 import { useOwnDebugContext } from "@web/core/debug/debug_context";
-import { useLegacyRefs } from "@web/legacy/utils";
 
 import { useEffect } from "@odoo/owl";
 
-const LEGACY_SIZE_CLASSES = {
-    "extra-large": "xl",
-    large: "lg",
-    medium: "md",
-    small: "sm",
-};
-
-// -----------------------------------------------------------------------------
-// Action Dialog (Component)
-// -----------------------------------------------------------------------------
-class ActionDialog extends Dialog {
+export class ActionDialog extends Dialog {
     setup() {
         super.setup();
         useOwnDebugContext();
@@ -49,35 +38,3 @@ ActionDialog.defaultProps = {
     ...Dialog.defaultProps,
     withBodyPadding: false,
 };
-
-/**
- * This LegacyAdaptedActionDialog class will disappear when legacy code will be entirely rewritten.
- * The "ActionDialog" class should get exported from this file when the cleaning will occur, and it
- * should stop extending Dialog and use it normally instead at that point.
- */
-class LegacyAdaptedActionDialog extends ActionDialog {
-    setup() {
-        super.setup();
-        const actionProps = this.props && this.props.actionProps;
-        const actionContext = actionProps && actionProps.context;
-        const actionDialogSize = actionContext && actionContext.dialog_size;
-        this.props.size = LEGACY_SIZE_CLASSES[actionDialogSize] || Dialog.defaultProps.size;
-        const ControllerComponent = this.props && this.props.ActionComponent;
-        const Controller = ControllerComponent && ControllerComponent.Component;
-        this.isLegacy = Controller && Controller.isLegacy;
-        const legacyRefs = useLegacyRefs();
-        useEffect(
-            () => {
-                if (this.isLegacy) {
-                    // Render legacy footer buttons
-                    const footer = this.modalRef.el.querySelector("footer");
-                    legacyRefs.widget.renderButtons($(footer));
-                }
-            },
-            () => []
-        );
-    }
-}
-LegacyAdaptedActionDialog.template = "web.LegacyAdaptedActionDialog";
-
-export { LegacyAdaptedActionDialog as ActionDialog };
diff --git a/addons/web/static/src/webclient/actions/action_dialog.xml b/addons/web/static/src/webclient/actions/action_dialog.xml
index 8775f13daae..14cf92ba409 100644
--- a/addons/web/static/src/webclient/actions/action_dialog.xml
+++ b/addons/web/static/src/webclient/actions/action_dialog.xml
@@ -23,14 +23,4 @@
     </xpath>
   </t>
 
-  <t t-name="web.LegacyAdaptedActionDialog" t-inherit="web.ActionDialog" t-inherit-mode="primary">
-    <xpath expr="//t[@t-slot='footer']" position="replace">
-      <t t-if="!isLegacy">
-        <t t-slot="buttons">
-          <button class="btn btn-primary o-default-button" t-on-click="() => this.data.close()">Ok</button>
-        </t>
-      </t>
-    </xpath>
-  </t>
-
 </templates>
diff --git a/addons/web/static/src/webclient/actions/action_service.js b/addons/web/static/src/webclient/actions/action_service.js
index 6f2fce4f2cb..11c29947430 100644
--- a/addons/web/static/src/webclient/actions/action_service.js
+++ b/addons/web/static/src/webclient/actions/action_service.js
@@ -93,6 +93,13 @@ function parseActiveIds(ids) {
     return activeIds;
 }
 
+const DIALOG_SIZES = {
+    "extra-large": "xl",
+    large: "lg",
+    medium: "md",
+    small: "sm",
+};
+
 // -----------------------------------------------------------------------------
 // Errors
 // -----------------------------------------------------------------------------
@@ -775,7 +782,6 @@ function makeActionManager(env) {
         if (action.target === "new") {
             cleanDomFromBootstrap();
             const actionDialogProps = {
-                // TODO add size
                 ActionComponent: ControllerComponent,
                 actionProps: controller.props,
                 actionType: action.type,
@@ -783,6 +789,10 @@ function makeActionManager(env) {
             if (action.name) {
                 actionDialogProps.title = action.name;
             }
+            const size = DIALOG_SIZES[action.context.dialog_size];
+            if (size) {
+                actionDialogProps.size = size;
+            }
 
             const onClose = _removeDialog();
             removeDialogFn = env.services.dialog.add(ActionDialog, actionDialogProps, {