For my WordPress site, , I have a blog which has a custom sidebar. (sidebar-blog.php)

When you click on a single post (single.php), the sidebar goes away, even though it is correctly coded into the php. - Single.php - sidebar-blog.php

Is there any idea why this isn't showing up? I'm not super proficient when it comes to editing functions.php, so if it involves that, please explain it in simple terms and specifically.

Thank you!