The app doesn;t show the sidebar. That is wierd because it was working untill now.
There is a bug affecting Community Cloud that is hiding the sidebar by default, unintentionally. (It should still be there, it’s just collapsed. Let me know if you mean otherwise.)
The bug report is here and a fix is underway.
opened 01:08PM - 19 Jun 25 UTC
type:bug
type:regression
status:confirmed
priority:P2
### Checklist
- [x] I have searched the [existing issues](https://github.com/st… reamlit/streamlit/issues) for similar issues.
- [x] I added a very descriptive title to this issue.
- [x] I have provided sufficient information below to help reproduce this issue.
### Summary
1.46.0 included some changes to the sidebar, now some apps initialize with a collapsed sidebar unexpectedly.
On [this docs page](https://docs.streamlit.io/develop/concepts/configuration/theming), embedded apps correctly initialize with expanded sidebars, but if the apps are visited fullscreen, the sidebars are collapsed.
However, this doesn't seem to happen when I run the app locally; this only seems to be happening on the hosted app. (And I ran the app from the root of the repo since we also made some changes in how config files are picked up.)
### Reproducible Code Example
```Python
import streamlit as st
st.sidebar.markdown("# Sidebar")
st.markdown("# Main Page 🎈")
```
### Steps To Reproduce
Run the app locally -> The sidebar is open by default.
Deploy the app on Community Cloud -> The sidebar is closed by default.
### Expected Behavior
The sidebar should be open by default for both hosts.
### Current Behavior
The sidebar is closed by default on Community Cloud.
### Is this a regression?
- [x] Yes, this used to work in a previous version.
### Debug info
- Streamlit version: 1.46.0
- Python version: 3.13
- Operating System: Debian Linux (Community Cloud)
- Browser: Prisma
### Additional Information
_No response_
system
December 21, 2025, 7:03pm
3
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