How to disable split screen in android?

Question

Hello how can i disable split screen in Redmi Note 7 (Android 10 - MIUI 12.5.1)?

Already tried this 2 codes but not working

 <activity
        android:name=".activities.SplashScreenActivity"
        android:label="@string/app_name"
        android:theme="@style/splashScreenTheme"
        android:resizeableActivity="false">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>

    </activity>

And

         <application
                android:name=".activity.MyApplication"
                android:allowBackup="true"
                android:icon="@drawable/btn_share_myapplication"
                android:label="@string/app_name"
                android:resizeableActivity="false"
                android:supportsRtl="true"
                android:theme="@style/AppTheme">
                <activity
                    android:name=".activity.SplashActivity"
                    android:screenOrientation="portrait">
                    <intent-filter>
                        <action android:name="android.intent.action.MAIN" />
                        <category android:name="android.intent.category.LAUNCHER" />
                    </intent-filter>
                </activity>
        <activity... />
        </application>