fix(sidebar): correct overflow for collapsible icon

[wan-kong]

🔗 Linked issue

❓ Type of change

• [ ] 📖 Documentation (updates to the documentation, readme or JSdoc annotations)
• [x] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [ ] 👌 Enhancement (improving an existing functionality like performance)
• [ ] ✨ New feature (a non-breaking change that adds functionality)
• [ ] 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

fix the #1507 correct overflow for collapsible icon

📸 Screenshots (if appropriate)

📝 Checklist

• [x] I have linked an issue or discussion.
• [ ] I have updated the documentation accordingly.