add expander

app.py

@@ -183,6 +183,5 @@ if st.session_state['count_checked'] > 0:
     # display summary tab
     print(f'display extra tab')
 
-st.header("DEBUG")
-st.divider()
-st.json(st.session_state)
+with st.expander("developer tool"):
+    st.json(st.session_state)