Added remark

app/src/main/res/layout/fragment_options_encryption.xml

@@ -86,6 +86,17 @@
                     app:layout_constraintTop_toBottomOf="@id/tvCaptionGeneral"
                     app:srcCompat="@drawable/twotone_info_24" />
 
+                <TextView
+                    android:id="@+id/tvDefaultMethod"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="12dp"
+                    android:text="@string/title_advanced_default_encryption"
+                    android:textAppearance="@style/TextAppearance.AppCompat.Small"
+                    android:textStyle="italic"
+                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintTop_toBottomOf="@id/ibInfo" />
+
                 <androidx.appcompat.widget.SwitchCompat
                     android:id="@+id/swSign"
                     android:layout_width="0dp"
@@ -94,7 +105,7 @@
                     android:text="@string/title_advanced_sign_default"
                     app:layout_constraintEnd_toEndOf="parent"
                     app:layout_constraintStart_toStartOf="parent"
-                    app:layout_constraintTop_toBottomOf="@id/ibInfo"
+                    app:layout_constraintTop_toBottomOf="@id/tvDefaultMethod"
                     app:switchPadding="12dp" />
 
                 <androidx.appcompat.widget.SwitchCompat

app/src/main/res/values/strings.xml

@@ -774,6 +774,10 @@
     <string name="title_advanced_clear_all">Delete the app data</string>
     <string name="title_advanced_clear_all_remark">The app data will be irreversibly deleted!</string>
 
+    <string name="title_advanced_default_encryption">
+        The default encryption method (PGP or S/MIME) will be stored per identity after sending a signed or encrypted message.
+        The encryption method can be selected before sending in the send options dialog box (long press the send button).
+    </string>
     <string name="title_advanced_sign_default">Sign by default</string>
     <string name="title_advanced_encrypt_default">Encrypt by default</string>
     <string name="title_advanced_encrypt_auto">Automatically encrypt when all recipients\' keys are available</string>