diff --git a/vector/src/main/java/im/vector/app/core/platform/VectorBaseActivity.kt b/vector/src/main/java/im/vector/app/core/platform/VectorBaseActivity.kt
index 0d1bb6eb0d..dcec88bdbc 100644
--- a/vector/src/main/java/im/vector/app/core/platform/VectorBaseActivity.kt
+++ b/vector/src/main/java/im/vector/app/core/platform/VectorBaseActivity.kt
@@ -10,13 +10,11 @@ package im.vector.app.core.platform
 import android.annotation.SuppressLint
 import android.app.Activity
 import android.content.Context
-import android.os.Build
 import android.os.Bundle
 import android.view.Menu
 import android.view.MenuInflater
 import android.view.MenuItem
 import android.view.View
-import android.view.WindowInsetsController
 import android.view.WindowManager
 import android.widget.TextView
 import androidx.annotation.CallSuper
@@ -25,7 +23,6 @@ import androidx.annotation.StringRes
 import androidx.appcompat.app.AppCompatActivity
 import androidx.coordinatorlayout.widget.CoordinatorLayout
 import androidx.core.app.MultiWindowModeChangedInfo
-import androidx.core.content.ContextCompat
 import androidx.core.util.Consumer
 import androidx.core.view.MenuProvider
 import androidx.core.view.isVisible
@@ -336,7 +333,8 @@ abstract class VectorBaseActivity<VB : ViewBinding> : AppCompatActivity(), Maver
     private fun handleCertificateError(certificateError: GlobalError.CertificateError) {
         singletonEntryPoint()
                 .unrecognizedCertificateDialog()
-                .show(this,
+                .show(
+                        this,
                         certificateError.fingerprint,
                         object : UnrecognizedCertificateDialog.Callback {
                             override fun onAccept() {
@@ -446,14 +444,6 @@ abstract class VectorBaseActivity<VB : ViewBinding> : AppCompatActivity(), Maver
         mdmService.unregisterListener(this)
     }
 
-    override fun onWindowFocusChanged(hasFocus: Boolean) {
-        super.onWindowFocusChanged(hasFocus)
-
-        if (hasFocus && displayInFullscreen()) {
-            setFullScreen()
-        }
-    }
-
     private val onMultiWindowModeChangedListener = Consumer<MultiWindowModeChangedInfo> {
         Timber.w("onMultiWindowModeChanged. isInMultiWindowMode: ${it.isInMultiWindowMode}")
         bugReporter.inMultiWindowMode = it.isInMultiWindowMode
@@ -463,33 +453,6 @@ abstract class VectorBaseActivity<VB : ViewBinding> : AppCompatActivity(), Maver
      * PRIVATE METHODS
      * ========================================================================================== */
 
-    /**
-     * Force to render the activity in fullscreen.
-     */
-    private fun setFullScreen() {
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
-            // New API instead of SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN and SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
-            @Suppress("DEPRECATION")
-            window.setDecorFitsSystemWindows(false)
-            // New API instead of SYSTEM_UI_FLAG_IMMERSIVE
-            window.decorView.windowInsetsController?.systemBarsBehavior = WindowInsetsController.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
-            // New API instead of FLAG_TRANSLUCENT_STATUS
-            @Suppress("DEPRECATION")
-            window.statusBarColor = ContextCompat.getColor(this, im.vector.lib.ui.styles.R.color.half_transparent_status_bar)
-            // New API instead of FLAG_TRANSLUCENT_NAVIGATION
-            @Suppress("DEPRECATION")
-            window.navigationBarColor = ContextCompat.getColor(this, im.vector.lib.ui.styles.R.color.half_transparent_status_bar)
-        } else {
-            @Suppress("DEPRECATION")
-            window.decorView.systemUiVisibility = (View.SYSTEM_UI_FLAG_LAYOUT_STABLE
-                    or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
-                    or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
-                    or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
-                    or View.SYSTEM_UI_FLAG_FULLSCREEN
-                    or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY)
-        }
-    }
-
     private fun handleMenuItemHome(item: MenuItem): Boolean {
         return when (item.itemId) {
             android.R.id.home -> {
@@ -591,8 +554,6 @@ abstract class VectorBaseActivity<VB : ViewBinding> : AppCompatActivity(), Maver
 
     abstract fun getBinding(): VB
 
-    open fun displayInFullscreen() = false
-
     open fun doBeforeSetContentView() = Unit
 
     open fun initUiAndData() = Unit