Short answer
HubSpot's KB: each blog has only one listing page, edited with drag and drop in the content editor. Editing coded listing templates needs Marketing or Content Hub Professional or Enterprise and Design tools permission.
1. In HubSpot
The relevant screen in my demo portal.

2. Worth knowing
Because each blog has one, you edit the listing page rather than unpublish it.
3. Related
Authors and tags and featured images.