How to use st.link_button() to navigate to a link within the same tab without creating new session?
st.link_button always opens another tab, but depending on what you want to do you might be able to solve the problem with a different solution.
If you’re just trying to switch to a different page, you could use this https://extras.streamlit.app/Switch%20page%20function
If you’re trying to jump to a different part of the page, you can use something like this
st.markdown("<a href='#hello-world'>Go to title</a>", unsafe_allow_html=True)
Each title, and header automatically gets an anchor tag associated with it that you can see by hovering over it and clicking on the 
If you can explain more about your use-case, perhaps I or others can suggest some other options.