Hey @hahahazel,
So st.bar_chart is just a wrapper and is just meant as an easy way to create an Altair chart.
See docs.streamlit.io/library/api-reference/charts/st.bar_chart#stbar_chart
If you want a graph horizontal, you will need to create that chart yourself in Altair (or another python plotting library) rotate it with that library and then pass it to the appropriate streamlit function.
For Altair that’s: st.altair_chart
Docs for that here: docs.streamlit.io/library/api-reference/charts/st.altair_chart#staltair_chart
Actually for Altair, it looks like they just have a horizontal bar chart function:
https://altair-viz.github.io/gallery/bar_chart_horizontal.html
Happy Streamlit-ing
Marisa