Hi everyone,
I’m customizing the Discourse sidebar and would like to create a custom collapsible section in the left sidebar, similar to the default “Categories” section — but tailored to my needs.
Here’s exactly what I want to achieve:
•	I want to create a custom section in the sidebar called “AI”.
•	When a user clicks to expand “AI”, it should reveal subcategories, like:
•	Agent
•	LLM
•	Prompting
Similarly, I want to create another collapsible section called “Crypto”, with subcategories like:
•	Bitcoin
•	Ethereum
•	DeFi
I already created the main categories and subcategories in Discourse. Now I just want these to appear in the sidebar grouped and collapsible, with their respective child categories underneath.
Is there a way to manually define such sections using the interface? Or does this require a plugin or theme component?
Any help or examples would be very appreciated. Thanks in advance!