docs: add project-level case_sensitive option to lightdash.config.yml (#463)

Generated-By: mintlify-agent

Co-authored-by: mintlify[bot] <109931778+mintlify[bot]@users.noreply.github.com>

Author: mintlify[bot]

references/dimensions.mdx

@@ -1259,7 +1259,7 @@ This setting affects the following filter operators: `equals`, `not equals`, `st
 With `case_sensitive: false`, filtering for "john" would match "John", "JOHN", "john", etc.
 
 <Info>
-  Dimension-level `case_sensitive` settings override any explore-level `case_sensitive` setting. See [Tables reference](/references/tables#case-sensitive) for explore-level configuration.
+  Dimension-level `case_sensitive` settings override explore-level and project-level settings. See [Tables reference](/references/tables#case-sensitive) for explore-level configuration and [lightdash.config.yml reference](/references/lightdash-config-yml#defaults-configuration) for project-level defaults.
 </Info>
 
 

references/lightdash-config-yml.mdx

@@ -1,6 +1,6 @@
 ---
 title: "lightdash.config.yml reference"
-description: 'The lightdash.config.yml file allows you to configure project-wide settings for your Lightdash project, including spotlight and parameters.'
+description: 'The lightdash.config.yml file allows you to configure project-wide settings for your Lightdash project, including spotlight, parameters, and defaults.'
 sidebarTitle: "lightdash.config.yml"
 ---
 
@@ -89,6 +89,10 @@ spotlight:
 # Configuration for project-wide parameters
 parameters:
   # ...
+
+# Configuration for project-wide defaults
+defaults:
+  # ...
 ```
 
 
@@ -198,4 +202,50 @@ Or using the shorter alias:
 ${ld.parameters.region}
 ```
 
-See the [Parameters guide](/guides/developer/using-parameters) for more information on how to use parameters.
+See the [Parameters guide](/guides/developer/using-parameters) for more information on how to use parameters.
+
+
+## Defaults configuration
+
+The `defaults` section allows you to set project-wide default settings that apply across all explores and dimensions. These defaults can be overridden at the explore or dimension level.
+
+```yaml
+defaults:
+  case_sensitive: false
+```
+
+| Property         | Required | Value   | Description |
+| :--------------- | :------- | :------ | :---------- |
+| `case_sensitive` | No       | boolean | Default case sensitivity for string filters across the project. When `false`, all string filters will be case insensitive by default. Defaults to `true`. |
+
+
+### Case sensitivity hierarchy
+
+The `case_sensitive` setting follows a hierarchy where more specific settings override broader ones:
+
+1. **Dimension-level** (highest priority) - Set on individual dimensions
+2. **Explore/table-level** - Set on the explore or table
+3. **Project-level** - Set in `lightdash.config.yml` defaults
+4. **Default behavior** - Case sensitive (`true`) if nothing is specified
+
+This allows you to set organization-wide defaults while maintaining the flexibility to override them for specific explores or dimensions as needed.
+
+**Example**: Set case insensitivity as the project default, but override for a specific table:
+
+```yaml
+# lightdash.config.yml
+defaults:
+  case_sensitive: false  # Project-wide default
+```
+
+```yaml
+# In your model yml file - override for a specific table
+models:
+  - name: case_sensitive_table
+    meta:
+      case_sensitive: true  # Override: this table uses case sensitive filters
+```
+
+<Info>
+  See [Tables reference](/references/tables#case-sensitive) for explore-level configuration and [Dimensions reference](/references/dimensions#case-sensitive) for dimension-level configuration.
+</Info>

references/tables.mdx

@@ -943,7 +943,7 @@ This setting affects the following filter operators: `equals`, `not equals`, `st
 With `case_sensitive: false`, filtering for "john" on any string dimension would match "John", "JOHN", "john", etc.
 
 <Info>
-  Dimension-level `case_sensitive` settings override the table-level setting. See [Dimensions reference](/references/dimensions#case-sensitive) for dimension-level configuration.
+  Table-level `case_sensitive` settings override the project-level default. Dimension-level settings override both. See [Dimensions reference](/references/dimensions#case-sensitive) for dimension-level configuration and [lightdash.config.yml reference](/references/lightdash-config-yml#defaults-configuration) for project-level defaults.
 </Info>
 
 ## Parameters configuration