Hi @cs73 , you can create new template on 2.0 theme from Shopify store admin > Sale channels > Online store > Themes > Customize > Collections > Create template
Locate the code that outputs the collection products, which should look something like this:
{% for product in collection.products %}
## {{ product.title }}
{{ product.price | money }}
{% endfor %}
Add a new block of code above or below this section to display the desired sidebar for the collection page you want to customize. For example, you can create a new div that will contain the sidebar and add it just before the tag that closes the “collection-main” div:
### Custom Sidebar
This is a custom sidebar for the collection page.
Save changes.
Go back to Online Store → Pages
Find the page that corresponds to the collection you want to customize → Edit