Unable to change default option in streamlit app when using multiselect()

Using Streamlit
1

Issue: I am facing an issue of not able to select any other option other than default option when using st.multiselect() . I have also tried st.selectbox but faced an issue with that as well.

Links

Demo web app link for issue: https://party-crime-record.streamlit.app/

Web page Code on github: Github link

multiselect option code chunk starts from line number: 46

Code snippet

with st.sidebar:
    State_List = df.lazy().select(pl.col('State')).unique().collect().to_series().to_list()

    # State_Selected = st.selectbox(label="Select State",
    #                               options = State_List)

    State_Selected = st.multiselect(label="Select State",
                                    options = State_List,
                                    default = ["Uttar Pradesh"], # Delhi West Bengal  
                                    # default = State_List[-1],
                                    max_selections=1
                                       )

Expected behavior:

To be able to select any one option out of the 4 provided options that will create another input for the Year filter and also filter the data.

Actual behavior:

Every time I delete the default option it appears again without letting me select any other option.

Version

streamlit==1.21.0
polars==0.17.1
pandas==1.5.3
Python==3.9.16

2

Closing this thread as a duplicate in case someone comes along to reply. Active thread is here: