Update app.py

app.py

@@ -71,6 +71,9 @@ df_merged = df_merged.merge(prices['NASDAQ'][['Date', 'Close_NASDAQ']], on='Date
 def show_sentiment(selected_companies=None, aggregation="Day", selected_year="All"):
     if not selected_companies:
         selected_companies = ["NASDAQ"]
+        
+    if isinstance(selected_companies, str):
+    selected_companies = [selected_companies]
 
     df_filtered = df_merged.copy()
     if selected_year != "All" and selected_year is not None:
@@ -158,7 +161,7 @@ demo = gr.Interface(
             choices=companies,
             value=None,
             label="Select Companies (NASDAQ compares with general sentiment)",
-            multiselect=True
+            multiselect=False
         ),
         gr.Radio(
             choices=["Month", "Year"],