Saving Excel files as per checkbox

I am using checkbox ( that are excel sheet names) based on number of checkboxes selected, I want to save on those sheets on excel file . When I select a check box, the page refreshes

        out_path = r"D:\\\file.xlsx"
        writer = pd.ExcelWriter(out_path, engine='xlsxwriter')
        
        st.sidebar.write('Select your required sheets')
        aa=st.sidebar.checkbox("sheet1")
        bb=st.sidebar.checkbox("sheet2")
        cc=st.sidebar.checkbox("sheet3")
        dd=st.sidebar.checkbox("sheet4")
        ee=st.sidebar.checkbox("sheet5")
        
        if aa==1:
            dr.to_excel(writer, sheet_name='sheet1',index= False )           
        elif bb==1:
            dt.to_excel(writer, sheet_name='sheet2',index= False)  
        elif cc==1:
            ds.to_excel(writer, sheet_name='sheet3',index= False)   
        elif dd==1:
            du.to_excel(writer, sheet_name='sheet4',index= False) 
        elif ee==1:
            de.to_excel(writer, sheet_name='sheet5',index= False)        
        else:
            st.write("You didn't select anything")
        if st.sidebar.button('OK'):
            writer.save()