2 files changed, 2 insertions, 2 deletions
diff --git a/addons/mail/static/src/js/chat_window.js b/addons/mail/static/src/js/chat_window.js
index 0c3a2270045..c8cfecd193f 100644
--- a/addons/mail/static/src/js/chat_window.js
+++ b/addons/mail/static/src/js/chat_window.js
@@ -150,7 +150,7 @@ return Widget.extend({
         this.trigger("close_chat_session");
     },
     on_click_fold: function () {
-        if (config.device.size_class !== config.device.SIZES.XS) {
+        if (!config.device.isMobile) {
             this.toggle_fold();
             this.trigger("fold_channel", this.channel_id, this.folded);
         }
diff --git a/addons/mail/static/src/js/window_manager.js b/addons/mail/static/src/js/window_manager.js
index 28bf4ad71e9..147a3762068 100644
--- a/addons/mail/static/src/js/window_manager.js
+++ b/addons/mail/static/src/js/window_manager.js
@@ -193,7 +193,7 @@ function toggle_fold_chat (channel) {
 }
 
 function compute_available_slots (nb_windows) {
-    if (config.device.size_class === config.device.SIZES.XS) {
+    if (config.device.isMobile) {
         display_state.nb_slots = 1; // one chat window full screen in mobile
         return;
     }