normalize_headers = st.checkbox(

        "Normalize headers for comparison",

         value=AppConfig.DEFAULT_NORMALIZE_HEADERS,

         help="Treat 'Overall Start' and 'overall_start' as the same column"

)

expand_abbreviations = st.checkbox(

        "Expand header abbreviations",

         value=AppConfig.DEFAULT_EXPAND_ABBREVIATIONS,

         help="Treat 'start_dt' and 'start_date' as the same column (dt→date, st→start, etc.)"

)

if expand_abbreviations:

    with st.expander("📝 Supported Abbreviations"):

          st.write("Common abbreviations that will be expanded:")

          abbrev_text =", ".join([f"**{k}**→{v}"for k, v inlist(AppConfig.HEADER_ABBREVIATIONS.items())[:12]])

          st.markdown(abbrev_text +", and more...")




Also update lines 86-90:

Replace your current ComparisonSettings creation with:

python

            st.session_state.comparison_settings = ComparisonSettings(

                float_tolerance=float_tolerance,

                case_sensitive=case_sensitive,

                normalize_headers=normalize_headers,        # ADD THIS

                expand_abbreviations=expand_abbreviations,  # ADD THIS

                max_mismatches=AppConfig.MAX_MISMATCHES_DISPLAY

            )

So you're adding the new checkboxes between lines 80 and 84, and updating the settings creation at lines 86-90! 🎯