diff --git a/addons/mail/static/src/components/discuss_sidebar_item/discuss_sidebar_item.scss b/addons/mail/static/src/components/discuss_sidebar_item/discuss_sidebar_item.scss
index 649297585f9..aebc4b9a1bb 100644
--- a/addons/mail/static/src/components/discuss_sidebar_item/discuss_sidebar_item.scss
+++ b/addons/mail/static/src/components/discuss_sidebar_item/discuss_sidebar_item.scss
@@ -15,6 +15,7 @@
 .o_DiscussSidebarItem_activeIndicator {
     width: $o-mail-discuss-sidebar-active-indicator-width;
     align-self: stretch;
+    flex: 0 0 auto;
 }
 
 .o_DiscussSidebarItem_command {
@@ -51,6 +52,7 @@
 .o_DiscussSidebarItem_name {
     overflow: hidden;
     text-overflow: ellipsis;
+    white-space: nowrap;
 
     &.o-editable {
         margin-left: $o-mail-discuss-sidebar-active-indicator-width + $o-mail-discuss-sidebar-active-indicator-margin-right;
diff --git a/addons/mail/static/src/components/thread_icon/thread_icon.scss b/addons/mail/static/src/components/thread_icon/thread_icon.scss
index f27b48d0a8b..3824ec44a37 100644
--- a/addons/mail/static/src/components/thread_icon/thread_icon.scss
+++ b/addons/mail/static/src/components/thread_icon/thread_icon.scss
@@ -1,4 +1,3 @@
-
 // ------------------------------------------------------------------
 // Layout
 // ------------------------------------------------------------------
@@ -7,6 +6,7 @@
     display: flex;
     width: 13px;
     justify-content: center;
+    flex: 0 0 auto;
 }
 
 .o_ThreadIcon_typing {