diff --git a/app/src/main/java/com/infomaniak/mail/ui/main/folder/TwoPaneFragment.kt b/app/src/main/java/com/infomaniak/mail/ui/main/folder/TwoPaneFragment.kt
index c281cb6aae..2fa09953fb 100644
--- a/app/src/main/java/com/infomaniak/mail/ui/main/folder/TwoPaneFragment.kt
+++ b/app/src/main/java/com/infomaniak/mail/ui/main/folder/TwoPaneFragment.kt
@@ -82,6 +82,7 @@ abstract class TwoPaneFragment : Fragment() {
     override fun onConfigurationChanged(newConfig: Configuration) {
         super.onConfigurationChanged(newConfig)
         updateDrawerLockMode()
+        ensureThreadIsDisplayed(newConfig.orientation)
     }
 
     private fun setupSlidingPane() = with(slidingPaneLayout) {
@@ -192,4 +193,10 @@ abstract class TwoPaneFragment : Fragment() {
             )
         }
     }
+
+    private fun ensureThreadIsDisplayed(orientation: Int) {
+        if (orientation == Configuration.ORIENTATION_PORTRAIT && twoPaneViewModel.isInThreadInPhoneMode(requireContext())) {
+            slidingPaneLayout.openPaneNoAnimation()
+        }
+    }
 }