> For the complete documentation index, see [llms.txt](https://docs.notionapps.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.notionapps.com/customize-app/relations.md).

# Relations

Relation properties can be used on NotionApps by either showing the related page data in your app configurations or using the List or Page Selector components.

{% hint style="info" %}
If you don't see Relation properties in your app builder, please click the "Reload" button. 
{% endhint %}

## Showing Related Page Data

Properties from related databases could be used in multiple app configurations to show data from the related pages. 

<figure><img src="/files/Fw7m3SPrTo2Grc3Yag2J" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/AzKtbVOrFNH3PLb8UEIb" alt=""><figcaption></figcaption></figure>

## List & Page Selector Components

These components can link, unlink, add, update, or delete related page items.&#x20;

### List Component

A List component can display an **Inline LIST** of related page items on your form or details screens.&#x20;

In addition to that, you can create new related pages, and link or unlink pages from the related database.

### Page Selector Component

A Page Selector component can open a new screen to link or unlink existing pages from the related database.

<figure><img src="/files/cmVyPOuY0eNJncJU2Pcu" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/RPrLSUs4RMKz8QSsZVxC" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/CF6SZnWdjLhNsxVo6H88" alt=""><figcaption></figcaption></figure>

## Show Reload Button

List and page selector components provide an option to "Show Reload Button" next to the component. You should enable this option if:

You have more than 25 pages related to a single page and want to show all the related pages.&#x20;

For example, a Project is linked to 50 Tasks. Without the reload button, we only show the top 25 Tasks. If you enable the reload button, we load all 50 Tasks.&#x20;

{% hint style="info" %}
The same logic applies to the reload button when viewing formulas and rollups in NotionApps. If the formula or rollup is calculated over more than 25 related pages, you should enable the "Show Reload Button" option.&#x20;
{% endhint %}


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