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# Configure Settings in the App

> Learn how to configure settings in the app, including selecting options, configuring fields, and saving changes.

Learn how to configure settings in the app, including selecting options, configuring fields, and saving changes.

Launch the app instance.

From the landing page of the app, select **Options** > **Settings** to open the settings page. Upon the first launch of the instance, you are automatically navigated to the setting page.

Configure the settings as specified below and click **Save** to save the settings.

<table>
  <tr>
    <th>
      Field
    </th>

    <th>
      Description
    </th>
  </tr>

  <tr>
    <td>
      Entity Source Object
    </td>

    <td>
      No selection is required. The only available option is **Account**. This field identifies the source object of the differentiator entity.

      > **Note**
      >
      > If you want invoice numbering to be based on a subscription attribute instead, contact your Engagement Manager.
    </td>
  </tr>

  <tr>
    <td>
      Account Entity Field
    </td>

    <td>
      Select the account-level custom field defined for the entity.
    </td>
  </tr>

  <tr>
    <td>
      Target Invoice Number Field
    </td>

    <td>
      Select the invoice number custom field configured in Step 6 of [Configure Settings for Enhanced Invoice Numbering](/docs/platform/integration/integration-hub/core-connectors-and-applications/enhanced-invoice-numbering/configure-enhanced-invoice-numbering/add-custom-fields-for-the-app-in-zuora).
    </td>
  </tr>

  <tr>
    <td>
      Enable Writing Entity to Invoice
    </td>

    <td>
      Determines whether the entity is displayed on invoices.

      * **Enabled** - Displays the entity on invoices.
      * **Disabled** - Does not display the entity on invoices.
    </td>
  </tr>

  <tr>
    <td>
      Target Invoice Entity Field
    </td>

    <td>
      Select the invoice custom field used for the desired numbering format. If **Enable Writing Entity to Invoice** is enabled, this field is displayed on invoices.
    </td>
  </tr>

  <tr>
    <td>
      Post Invoices
    </td>

    <td>
      Determines whether draft invoices are posted.

      * **Enabled** - Draft invoices are posted.
      * **Disabled** - Draft invoices remain in draft status.
    </td>
  </tr>

  <tr>
    <td>
      Do Not Number \$0 Invoices
    </td>

    <td>
      Select this option to skip numbering for zero-value invoices.
    </td>
  </tr>

  <tr>
    <td>
      Update Invoice PDFs with Entity Number
    </td>

    <td>
      Select this option to update invoice PDFs with the new numbering format. This option is available only if the **Billing Document Properties Setup** feature is enabled on your tenant. The feature is currently in Limited Availability. To request access, contact [Zuora Global Support](https://support.zuora.com/).
    </td>
  </tr>

  <tr>
    <td>
      Send Customer Emails
    </td>

    <td>
      Determines whether customer emails are sent when posting invoices. You must configure and activate the **Manual Email For Invoice** notification before sending invoices manually.
    </td>
  </tr>
</table>