> For the complete documentation index, see [llms.txt](https://docs.b2ihealthcare.com/snow-owl-authoring-platform/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.b2ihealthcare.com/snow-owl-authoring-platform/introduction/preferences/snomed-ct-modules.md).
# SNOMED CT Settings
The SNOMED CT Settings allow you to specify the values for SNOMED CT modules, namespaces, and language preferences.
## Module
Select the  *SNOMED CT Settings* icon in the application's main toolbar where you can specify the settings for modules.
{% hint style="info" %}
The default module is the one selected during application startup.
{% endhint %}
To change the default module, clear the Module field, select another from the list, then click **`Apply and Close`**.
Available modules are automatically listed, i.e. every module concept that is the subtype of `900000000000443000|Module|` concept is available for selection.
## Namespace
Select the  *SNOMED CT Settings* icon in the application's main toolbar where you can specify the settings for namespaces.
{% hint style="info" %}
The default namespace is the one selected during application startup.
{% endhint %}
To change the default namespace, clear the Namespace field, select another from the list, then click **`Apply and Close`**.
Available namespaces are automatically listed, i.e. that every namespace concept that is the subtype of `370136006|Namespace concept|` is available for selection.
{% hint style="info" %}
Namespaces are distributed by SNOMED International.
{% endhint %}
## SNOMED CT display term
Specify which description type you would like to have the terms displayed with throughout the UI.
## Language settings
Select the  *SNOMED CT Settings* icon in the application's main toolbar where you can specify the language settings.
{% hint style="info" %}
Available Language reference sets depend on the dataset in use.
{% endhint %}
Check the Language Reference sets you would like to include, the selected ones will be displayed in concept editors and only those will be updated during authoring.
Set the order of preference using the arrows to the right of the dialog. Then click **`Apply and Close`**.
You can also create new Language reference sets or inactivate existing ones in Snow Owl. The language settings table is updated automatically in SNOMED CT Settings.
## Authoring mode selection
Select authoring modes: `Stated relationship-based authoring` and `OWL axiom-based authoring`. The point of keeping the two authoring modes separated from each other is to prevent users from performing unintentional, erroneous authoring actions. For further information, please visit the [Authoring Mode Selection](/snow-owl-authoring-platform/editing-and-authoring/authoring-mode-selection.md) paragraph.
## Descriptions for new concepts
Select how would you like to have the default description fields look like in case of new concept creation: pre-populated with the term of the reference concept or having empty Fully Specified Name and Preferred Term fields.
---
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