How do I enable the left/right column display on a blog post page?

The display of the left/right column on the entry page, we can enable in the appearance options of our store.
To do this, in the store menu, we expand the "Design" tab, and then select "Theme & Logo":




"Theme & Logo" tab will open for us:




and at the very bottom, on the right side there is a button "Choose layouts", which we click:




a list of pages of our store will appear, where we look for the page "module-pshowblog-entry":




we choose a layout, for example, with a right column - "Two Columns, small right column - Two columns with a small right column":




and save the changes:




Note!
If we have chosen to display the right column, make sure it is enabled.

We go to the module settings:




We select the "Main configuration" tab:




and enable the option "Display right column":