Opting-out of Steam betas

In your Steam Library if the game name has a label in brackets next to it you are on a Steam beta branch. For example "Unturned [preview]" is the preview beta, as seen in this screenshot:

You can opt-out of the beta here:

1. Right-click Unturned in your Steam Library
2. Click Properties
3. Select the Betas tab
4. From the dropdown select "None"