Added hint

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

@@ -106,6 +106,17 @@
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintTop_toBottomOf="@id/tvQuick" />
 
+        <TextView
+            android:id="@+id/tvQuickRemarkMultiple"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="@string/title_setup_wizard_multiple"
+            android:textAppearance="@style/TextAppearance.AppCompat.Small"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/btnQuick" />
+
         <TextView
             android:id="@+id/tvQuickRemark"
             android:layout_width="wrap_content"
@@ -115,7 +126,7 @@
             android:textAppearance="@style/TextAppearance.AppCompat.Medium"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"
-            app:layout_constraintTop_toBottomOf="@id/btnQuick" />
+            app:layout_constraintTop_toBottomOf="@id/tvQuickRemarkMultiple" />
 
         <!-- account -->
 

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

@@ -146,6 +146,7 @@
     <string name="title_setup_quick_imap">IMAP server to receive messages</string>
     <string name="title_setup_quick_smtp">SMTP server to send messages</string>
     <string name="title_setup_wizard">Wizard</string>
+    <string name="title_setup_wizard_multiple">The installation wizard can be used multiple times to set up multiple accounts</string>
     <string name="title_setup_wizard_remark">Go \'back\' to go to the inbox</string>
     <string name="title_setup_gmail" translatable="false">Gmail</string>
     <string name="title_setup_oauth" translatable="false">%1$s (OAuth)</string>