> For the complete documentation index, see [llms.txt](https://support.senar.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.senar.io/using-the-senar-app-and-ar-simulators/hiding-the-real-world-environment.md).

# Hiding the real-world environment

Large simulators include a "Background" mode that can be activated or deactivated at will. The background completely hides the user's real-world environment. This feature is particularly helpful in the following cases:

* The simulator is larger than the room in which it is used.
* The real environment is very crowded.
* Other students practicing nearby are disturbing the user's visual field.

Background can be activated or deactivated by tapping on the wall icon at the top of the screen:

<figure><img src="/files/Lbp4L9eqkvbZxGdLlTFa" alt="" width="563"><figcaption></figcaption></figure>


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