Hey @conrad welcome back!
I don’t think this is possible without implementing it in the source code. Now’s the moment to bring it in the GH issues as the team is currently redesigning the layout of Streamlit elements to enable horizontal layout, and the right sidebar could be squeezed in this process!
Do you mind writing an issue for this ? I’ll push it to the Streamlit devs then 
(similar to Streamlit Sidebar Questions)
Cheers,
Fanilo
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