> For the complete documentation index, see [llms.txt](https://appmaster.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://appmaster.gitbook.io/docs/data-design/data-models-designer.md).

# Data Models Designer

[**The Data Model Designer**](https://studio.appmaster.io/auth/login) is the main tool for creating data models, setting their properties (fields) and relationships in your project. It is located under the **Data Design tab of AppMaster Studio**.    

## Functions 

* Creation and editing of data models. 
* Creating and editing links between models. 

## Default items 

* **User data model** - automatically added to your application when you create a new project in **AppMaster Studio**. You will use it to create users.
* **System fields** are added to each data model when it is created.

## Operation  

You can **drag and drop elements** in the designer using the mouse pointer. To **change the scale** - by holding down the Ctrl key and scrolling the mouse wheel. Use the mouse pointer or scroll bars on the bottom and right to **move around the field**. 

To save changes - click **`Save schema`**.

![](https://3563768697-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MapxHzVskQ_27pNUTT4%2F-MgleVoXRJFxwc3-YFfZ%2F-Mglex3HGgyLNU1QNuox%2F3-move_models.gif?alt=media\&token=d39afbb4-7516-4cb1-8c78-9cdcf85fc404)