Update app.py

app.py

@@ -688,10 +688,8 @@ def show_field(f: Field, index: int, data_collected):
                     st.markdown(f.title)
 
             case 'expander':
-                # Markdown header above; expander label is plain text (blank)
-                with st.expander(""):
-                    st.markdown(f.title)
-                    for child in (f.children or []):
+                with (st.expander(f.title) if f.type == 'expander' else st.container(border=True)):
+                    for child in f.children:
                         show_field(child, index, data_collected)
 
             case 'container':