As demo: https://arena-handy.myshopify.com/collections/decor-art
The Collection menu as sidebar can show active sub-collection when you go to the links.
eg. https://arena-handy.myshopify.com/collections/personal
Steps
- Creat nestest menu to control hierarchy
- Assign nestest menu to Sub-Collection content.
1. Creat Nested Menu to your collections hierarchy.
More detail about Nestest menu: https://help.shopify.com/en/themes/development/building-nested-navigation
- Creat a collection nested menu.
2. Assign Nested Menu to display your Sidebar Collection Menu.
- From shopify admins, go to Online Store > Themes
- Find the theme that you want to edit and click Customize
- From the top bar drop-down menu, select the type of page that you want to edit. Select Collection pages
- Go to CONTENT > Add Content > Sidebar - Collection Menu
- Select Menu items
- Click Save