diff --git a/docs/admin/api.rst b/docs/admin/api.rst
index 7bf465404..0a42a95de 100644
--- a/docs/admin/api.rst
+++ b/docs/admin/api.rst
@@ -24,7 +24,6 @@ Sample response
        "images",
      ],
      "default_locale": "",
-     "default_theme": "simple",
      "engines": [
        {
          "categories": [
diff --git a/docs/admin/engines/nosql-engines.rst b/docs/admin/engines/nosql-engines.rst
index a50b9c367..fcf5a4cd0 100644
--- a/docs/admin/engines/nosql-engines.rst
+++ b/docs/admin/engines/nosql-engines.rst
@@ -18,12 +18,12 @@ All of the engines above are just commented out in the :origin:`settings.yml
 dependencies before using them.
 
 By default, the engines use the ``key-value`` template for displaying results /
-see :origin:`simple <searx/templates/simple/result_templates/key-value.html>`
-theme.  If you are not satisfied with the original result layout, you can use
-your own template, set ``result_template`` attribute to ``{template_name}`` and
-place the templates at::
+see :origin:`simple <searx/templates/result_templates/key-value.html>`.
+If you are not satisfied with the original result layout, you can use your own
+template, set ``result_template`` attribute to ``{template_name}`` and place
+the templates at::
 
-  searx/templates/{theme_name}/result_templates/{template_name}
+  searx/templates/result_templates/{template_name}
 
 Futhermore, if you do not wish to expose these engines on a public instance, you
 can still add them and limit the access by setting ``tokens`` as described in
diff --git a/docs/admin/engines/settings.rst b/docs/admin/engines/settings.rst
index 71ad29b43..555858346 100644
--- a/docs/admin/engines/settings.rst
+++ b/docs/admin/engines/settings.rst
@@ -232,7 +232,6 @@ Global Settings
      query_in_title: false
      infinite_scroll: false
      center_alignment: false
-     default_theme: simple
      theme_args:
        simple_style: auto
 
@@ -254,9 +253,6 @@ Global Settings
   side of the screen.  This setting only affects the *desktop layout*
   (:origin:`min-width: @tablet <searx/static/themes/simple/src/less/definitions.less>`)
 
-``default_theme`` :
-  Name of the theme you want to use by default on your SearXNG instance.
-
 ``theme_args.simple_style``:
   Style of simple theme: ``auto``, ``light``, ``dark``
 
diff --git a/docs/admin/engines/sql-engines.rst b/docs/admin/engines/sql-engines.rst
index d91383214..040fa1d99 100644
--- a/docs/admin/engines/sql-engines.rst
+++ b/docs/admin/engines/sql-engines.rst
@@ -30,12 +30,12 @@ engines, e.g. ``database:`` ...
      query_str: ...
 
 By default, the engines use the ``key-value`` template for displaying results /
-see :origin:`simple <searx/templates/simple/result_templates/key-value.html>`
-theme.  If you are not satisfied with the original result layout, you can use
+see :origin:`simple <searx/templates/result_templates/key-value.html>`.
+If you are not satisfied with the original result layout, you can use
 your own template, set ``result_template`` attribute to ``{template_name}`` and
 place the templates at::
 
-  searx/templates/{theme_name}/result_templates/{template_name}
+  searx/templates/result_templates/{template_name}
 
 If you do not wish to expose these engines on a public instance, you can still
 add them and limit the access by setting ``tokens`` as described in section
diff --git a/docs/dev/quickstart.rst b/docs/dev/quickstart.rst
index db52a2d80..66a10df42 100644
--- a/docs/dev/quickstart.rst
+++ b/docs/dev/quickstart.rst
@@ -25,7 +25,7 @@ choose a meaningful commit message and we are happy to receive your pull
 request. To not end in *wild west* we have some directives, please pay attention
 to our ":ref:`how to contribute`" guideline.
 
-If you implement themes, you will need to setup a :ref:`make node.env` once:
+If you implement theme, you will need to setup a :ref:`make node.env` once:
 
 .. code:: sh
 
diff --git a/docs/dev/search_api.rst b/docs/dev/search_api.rst
index 761c96303..ca697cf55 100644
--- a/docs/dev/search_api.rst
+++ b/docs/dev/search_api.rst
@@ -75,15 +75,6 @@ Parameters
   Filter search results of engines which support safe search.  See if an engine
   supports safe search in the preferences page of an instance.
 
-``theme`` : default ``simple``
-  [ ``simple`` ]
-
-  Theme of instance.
-
-  Please note, available themes depend on an instance.  It is possible that an
-  instance administrator deleted, created or renamed themes on their instance.
-  See the available options in the preferences page of the instance.
-
 ``enabled_plugins`` : optional
   List of enabled plugins.