Update app.py

app.py

@@ -212,13 +212,26 @@ if fetch_data:
             """
             stats_placeholder.markdown(stats_html, unsafe_allow_html=True)
 
-             # 📊 Most Common Subjects
-            st.subheader("Most Common Subjects")
+            # Calculate Top 10 Subjects
             if 'subject' in metadata_df.columns:
-                top_subjects = metadata_df['subject'].value_counts().head(10)
-                st.bar_chart(top_subjects)
-            else:
-                st.info("No subject metadata available to display.")
+                top_subjects = (
+                    metadata_df['subject']
+                    .dropna()
+                    .str.split(',')              # Split multiple subjects per record
+                    .explode()                   # Expand into separate rows
+                    .str.strip()                  # Remove whitespace
+                    .value_counts()
+                    .head(10)
+                    .to_frame(name="Count")
+                )
+
+            # 📚 Most Common Subjects in Sidebar
+            with st.sidebar.expander("Top 10 Most Common Subjects", expanded=True):
+                st.dataframe(
+                    top_subjects.style.background_gradient(cmap="Greens").format("{:.0f}"),
+                    use_container_width=True,
+                    height=240
+    )
 
         with st.sidebar.expander("🔗 Helpful Resources", expanded=False):
             st.markdown("""