Thank you very much. You pointed me in the right direction, though in fact I found the solution not under Optional Page or Post Sidebars, but rather the main Sidebar section. I just needed to choose Widget Context ‘Show widget on selected’ and then, under Global Sections, tick Blog Page and All posts.
So, once again, problem solved.
Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.