Pinboard comes with 18 templates. All these templates fall into four categories: Blog, Static Pages (content), Portfolio, others. You are selecting blog templates for static pages.
I’d like to have a left sidebar on a few of my pages (not all though)
- You have to select one of the templates having their name content. Here for your requirement, you need to select template either sidebar/content or sidebar/content half for required pages.
- Theme Options>>Layout>>Content Columns>> Select 3 or 4 from dropdown
- Add atleast one widget in one of the sidebar widget sections: Sidebar Top, Sidebar Left, Sidebar Right, Sidebar Bottom
Now your required page layout appear on the front end.