diff --git a/mkdocs.yml b/mkdocs.yml
index 7d00a996..7d5e4665 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -12,7 +12,6 @@ theme:
   logo: osipiImgs/OSIPI_logo.png
   favicon: osipiImgs/OSIPI_logo_only_square.png
   palette:
-
     # Palette toggle for light mode
     - media: "(prefers-color-scheme: light)"
       scheme: default
@@ -28,6 +27,8 @@ theme:
         name: Switch to light mode
   features:
     - search.suggest
+    - search.highlight
+    - search.share
   icon:
     admonition:
       note: fontawesome/solid/note-sticky
@@ -45,19 +46,20 @@ nav:
       - How to use the website: qualityOfLife.md
       - How to contribute: improved-contribution-tutorial.md
   - Sections:
-    - Q - Quantities: quantities.md
-    - M - Perfusion models: perfusionModels.md
-    - P - Perfusion processes: perfusionProcesses.md
-    - G - General purpose processes: generalPurposeProcesses.md
-    - D - Derived processes: derivedProcesses.md
+      - Q - Quantities: quantities.md
+      - M - Perfusion models: perfusionModels.md
+      - P - Perfusion processes: perfusionProcesses.md
+      - G - General purpose processes: generalPurposeProcesses.md
+      - D - Derived processes: derivedProcesses.md
   - Implementation Resources:
-    - DCE/DSC resources:
-      - DCE literature library: dceliterature.md
-    - Software tools:
-      - Software overview: softwareOverview.md
-      - Data simulation tools: simulationTools.md
-      - Analysis toolboxes: analysisToolboxes.md
-    - Sample datasets: sampleDatasets.md
+      - DCE/DSC resources:
+          - DCE literature library: dceliterature.md
+      - Software tools:
+          - Software overview: softwareOverview.md
+          - Data simulation tools: simulationTools.md
+          - Analysis toolboxes: analysisToolboxes.md
+      - Sample datasets: sampleDatasets.md
+      - Compartment definitions: compartmentDefinitions.md
 
 plugins:
   - search:
@@ -95,14 +97,6 @@ markdown_extensions:
   - md_in_html
   - abbr
 
-extra:
-  og:
-    type: website
-    title: Contrast-agent based perfusion MRI lexicon (CAPLEX)
-    description: CAPLEX
-    image: Social Card.png
-    url: https://osipi.github.io/OSIPI_CAPLEX/
-
 extra_javascript:
   - javascripts/extra.js
   - javascripts/mathjax.js
@@ -112,29 +106,36 @@ extra_javascript:
 extra_css:
   - stylesheets/extra.css
 
+# Merged 'extra' section (Fixed duplicate key error)
 extra:
+  og:
+    type: website
+    title: Contrast-agent based perfusion MRI lexicon (CAPLEX)
+    description: CAPLEX
+    image: Social Card.png
+    url: https://osipi.github.io/OSIPI_CAPLEX/
   analytics:
     provider: google
     property: G-27M7GKVZFQ
     feedback:
-        title: Was this page helpful?
-        ratings:
-          - icon: material/emoticon-happy-outline
-            name: This page was helpful
-            data: 1
-            note: >-
-              Thanks for your feedback! Help us improve this page by
-              using our <a href="https://forms.gle/dsfUEZx6P91rBwJe6" target="_blank" rel="noopener">feedback form</a>.
-          - icon: material/emoticon-sad-outline
-            name: This page could be improved
-            data: 0
-            note: >-
-              Thanks for your feedback! Help us improve this page by
-              using our <a href="https://forms.gle/dsfUEZx6P91rBwJe6" target="_blank" rel="noopener">feedback form</a>.
+      title: Was this page helpful?
+      ratings:
+        - icon: material/emoticon-happy-outline
+          name: This page was helpful
+          data: 1
+          note: >-
+            Thanks for your feedback! Help us improve this page by
+            using our <a href="https://forms.gle/dsfUEZx6P91rBwJe6" target="_blank" rel="noopener">feedback form</a>.
+        - icon: material/emoticon-sad-outline
+          name: This page could be improved
+          data: 0
+          note: >-
+            Thanks for your feedback! Help us improve this page by
+            using our <a href="https://forms.gle/dsfUEZx6P91rBwJe6" target="_blank" rel="noopener">feedback form</a>.
   consent:
     title: Cookie consent
     description: >-
       We use cookies to recognize your repeated visits and preferences, as well
       as to measure the effectiveness of our lexicon and whether users
       find what they're searching for. With your consent, you're helping us to
-      make our lexicon better.
+      make our lexicon better.
\ No newline at end of file