# Screen and Layer Timeline Properties

Three toggles and a slider are located to the right of the Screens and the Layers in the Timeline. They can be used in the following ways to affect both Screens and Layers:

![](https://2251001579-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2Ftachyon-documentation%2F-MZO1OADWupljsjjya6V%2F-MZO1w2MI6cru0HGyC-M%2F0.png?generation=1619622871523819\&alt=media)

## Cancel Rendering for a Screen or Layer

* **`Click`** on the **Lighting** toggle to cancel all image rendering for its corresponding Screen or Layer on the connected Display Servers.

{% hint style="info" %}
Cancelling image rendering makes manipulation invisible in its corresponding Layer or Screen.
{% endhint %}

## Lock a Screen or Layer

* **`Click`** on the Lock toggle to prevent any modifications to its corresponding Screen or Layer.

{% hint style="info" %}
The Lock prevents unwanted changes.
{% endhint %}

## Hide a Screen or Layer

* **`Click`** on the Eye toggle to turn its corresponding Screen or Layer to black.

## Modify Alpha for a Screen or Layer

* **`Click`+Drag**  the Alpha slider to modify the alpha channel value for its corresponding Screen or Layer.

![](https://2251001579-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MYzHHptIwrfWPsTrniB%2F-MZO210KPtaUH7OuyZI6%2F-MZO2SLuCAHYt3bjwPUm%2Fimage.png?alt=media\&token=851728bd-346d-4c14-afd9-eb958f8ad0aa)