## Create constrains automatically
### 1. Use autoconnect tool
Autoconnect can create two or more constraints for a UI element to the parent layout. After you drag the element to the layout, it creates constraints based on the element's position.
### 2. Infer constrains
The Infer Constraints tool infers, or figures out, the constraints you need to match a rough layout of elements. It works by taking into account the positions and sizes of the elements. Drag elements to the layout in the positions you want them, and use the Infer Constraints tool to automatically create the constraint connections.
## Position elements with constraint bias
After adding two opposing horizontal constraints—a left and a right constraint—a horizontal slider appears in the view inspector to adjust the bias of the element along the horizontal axis.
The measure of space between the element and the layout's border is known as the constraint bias. If the element is centered, its constraint bias is 50%.
If you add two opposing vertical constraints, a vertical slider appears to adjust the vertical bias.
## Baseline constraint
By using a baseline constraint, you can vertically align elements that have text, such as a TextView, EditText, or Button, so that the text baselines are aligned. Use baseline constraints to align elements that use different text sizes. Baseline constraints are also useful for aligning the text baselines of elements of different sizes.
The **ab** button for baseline alignment appears below the an element when this element has text in it.
## Expand elements
With the element selected click the **Expand Horizontally** or **Expand vertically** to expand the view horizontally to fill available space.
## Chains
Right-click on the selected elements and choose **Center Vertically **(or **Horizontally**). This will automatically create a chain as well as generate constraints to the top and bottom of the parent layout.
Select either EditText element, and drag the vertical bias slider. This will shift both elements towards the top without specifying a fixed constraint.