> For the complete documentation index, see [llms.txt](https://docs.datarhei.com/restreamer/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.datarhei.com/restreamer/knowledge-base/troubleshooting/why-do-i-see-env-and-cannot-select-anything.md).

# Why do I see ENV and cannot select anything?

{% hint style="info" %} <mark style="color:orange;background-color:red;">ENV</mark> = This value was set by an environment variable.
{% endhint %}

When starting the software via the shell, various settings can be activated. These settings are called “environment variables” and are marked with <mark style="background-color:red;">ENV</mark>. If a variable is activated at startup, it is no longer possible to adjust it in the graphical user interface.

## Recommended variables

It is not mandatory to set variables. All settings can also be configured via the graphical user interface.

### All environment variables on GitHub

{% embed url="<https://github.com/datarhei/core#environment-variables>" %}
**External URL:** All environments variables on GitHub
{% endembed %}

## Learn more

{% content-ref url="/pages/-MXbavufS1gwSzyDPNok" %}
[Premium Support](/restreamer/premium-support-1/helping-hands.md)
{% endcontent-ref %}

{% content-ref url="/pages/obgD22CebJtWA4GlfKrJ" %}
[Environment Variables](/restreamer/api/environment-variables.md)
{% endcontent-ref %}

{% content-ref url="/pages/5UuleQZ0OaxSy9HgMewO" %}
[What are environment variables?](/restreamer/knowledge-base/faq/what-are-environment-variables.md)
{% endcontent-ref %}

{% content-ref url="/pages/-MYd\_eWFK56LZQkA-iAN" %}
[User Guides](/restreamer/knowledge-base/user-guides.md)
{% endcontent-ref %}

{% content-ref url="/pages/-MXb\_m72sKwXpgM5udfT" %}
[Knowledge Base](/restreamer/knowledge-base/manual.md)
{% endcontent-ref %}