Can not set a sidebar on the Post Page

https://livingskywildliferehabilitation.org/wp-content/uploads/2021/01/PostPageSideBarDefault.jpg The link above is a screen shot of the post page (the main page that all the posts/blogs go on). There is a sidebar options tab for Optional 1, 2 or 3, but no where under 'Page Attribute' to set up the side bar to appear - ie where you would change it from default (no sidebar) to show primary content/right side bar. See this the 'page attributes' on the post/blog page: https://livingskywildliferehabilitation.org/wp-content/uploads/2021/01/PageAttribute-blogPage.jpg Compared to this for other pages: https://livingskywildliferehabilitation.org/wp-content/uploads/2021/01/PageAttribute.jpg I have the site set to static home page. Under Homepage/Frontpage I do not have either of the two buttons turned on. The site is now live https://livingskywildliferehabilitation.org/