Environments Menu
Click on the icon for environments. You will now see a list of available environments. In the topbar, you can toggle between normal environments and maps.
Download Environment
If you see an arrow icon in the bottom right corner of the environment button. It means the environment needs to be downloaded before you can start using it.
To download hover over the button. You will now see a bar with a title, description, and a button for download. Click on the download button. A pop-up will appear, where you can choose if you want to download, download and switch or cancel.
If you choose "download" it will be downloaded and you can see it with a green checkmark in your list. If you choose "download and switch", the environment will be added to the list, as well as to the active scene.
The active environment will always be at the top of the list.
Switch Environment
You can switch to any downloaded environment. Simply hover over the environment you want to switch to, and press the switch button to change the environment.
Sub Environments
Some environments also have something called "Sub Environments". If you see the icon shown in the top right corner of the image button in the gif. This icon means this environment has "Sub Environments". When you switch to one of these environments you will see a pop-up where you can toggle on and off the different sub environments.