force portrait mode

app/src/main/AndroidManifest.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest package="draw.simplemobiletools.com"
+<manifest
+    package="draw.simplemobiletools.com"
     xmlns:android="http://schemas.android.com/apk/res/android">
 
     <application
@@ -8,7 +9,9 @@
         android:label="@string/app_name"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
-        <activity android:name=".MainActivity">
+        <activity
+            android:name=".MainActivity"
+            android:screenOrientation="portrait">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
 
@@ -16,5 +19,4 @@
             </intent-filter>
         </activity>
     </application>
-
 </manifest>