These options are located in the Theme Options > Sidebars > Posts tab.

Posts Sidebar options control the global sidebar(s) display of all posts on the your site. (Fig. 1) What is a Sidebar?

Posts Sidebar options Screenshot
Fig. 1. Posts Sidebar options Screenshot.

 

Before applying a global sidebar(s) for a section of your site, you must assign widgets to widget areas. Then you can assign it to the sidebar you’d like to use as a global sidebar. See Sonnet Widget Areas

Global Posts Sidebar(s)

There are 4 buttons that control the display of the global sidebar(s) for posts.

No Sidebars – Illustrated as A. Do not display sidebars. (Fig. 1)

Left Sidebar – Illustrated as B. Select left sidebar that will display on posts. (Fig. 2)

Left Sidebar button Screenshot.
Fig. 2. Left Sidebar button Screenshot.

 

Right Sidebar – Illustrated as C. Select right sidebar that will display on posts. (Fig. 3)

Right Sidebar button Screenshot.
Fig. 3. Right Sidebar button Screenshot.

 

Both Sidebar – Illustrated as D. Select left sidebar and right sidebar that will display on posts. (Fig. 4)

Both Sidebar button Screenshot.
Fig. 4. Both Sidebars button Screenshot.