2 mutually exclusive nested button implementation

🎈 Using Streamlit
, ,
1

I am trying to implement Streamlit UI with two mutually exclusive operation button. each button has nested buttons. The buttons behavior should be like if i click on one button, than functions related to another button should not be visible, the code, i attached is working , but on clicking second button, which could be any of two, the content from previous button is still on UI. I tried multiple approaches. i solved nested button problem using st.session state. but when i select second button after clicking on first button, content from first button is still there, which i don’t expect . vice versa. please help me to solve this.
Sorry for bad english

sideb=st.sidebar
button1 = sideb.button('Single')
if st.session_state.get('button') != True:

    st.session_state['button'] = button1 # Saved the state

if st.session_state['button'] == True:

    st.write("button1 is True")

    option=st.selectbox('Select App?',
            ('A', 'B', 'C'),index=0)

     
    st.write('You selected:', option)
    option=option.lower()
    ''''SOME CHATTING APP WITHOUT ANY BUTTON '''
button2 = sideb.button('Multiple Queries')
if st.session_state.get('button2') != True:

    st.session_state['button2'] = button2 # Saved the state

if st.session_state['button2'] == True:
    uploaded_file = st.file_uploader("Choose a file with app_name and list_of questions.", type=['xlsx'], accept_multiple_files=False)
    st.write("button2 is True")
    if uploaded_file is not None:
        stqdm.pandas()
        df=pd.read_excel(uploaded_file)
    if st.button('Generate'):
        st.write("Do your logic here")
     
        with st.spinner('Wait for it...'):
            df['Answers']=df.progress_apply(qs, axis=1)
            AgGrid(df)
        st.success('Done!')
        csv = convert_df(df)
        download2 = st.download_button(
            label="Download Answers",
            data=csv,
            file_name='Answers.csv',
            key='download-csv'
        )
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