# Saving and activating

Once you've finished setting up your custom list, you'll need to save and activate it using the buttons at the top of the screen before your users can see it.

<figure><img src="/files/CYkAU2E0nJs7Lm6acfSI" alt=""><figcaption></figcaption></figure>

### Preview

You can view the configured List with the preview function available at the top of the builder screen.

### Add Tab

The Add Tab button at the top of the screen allows you to easily add tabs to your layouts, with your new custom list.

<figure><img src="/files/AuqjtxFdTaajMYUsth0f" alt=""><figcaption></figcaption></figure>

### Adding custom lists to the Lightning App Builder

1. If you want to insert a custom List into the App Builder, simply locate the List Configurator entry in the Custom area at the bottom left of the App Builder, and drag it to the desired location.
2. After dragging it to the desired location, select the List you want to configure on the right side by clicking on the relevant component.

<figure><img src="/files/wdxVQJ8cDsMo1H6CPHDX" alt=""><figcaption></figcaption></figure>


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