Sidebar when using a prebuilt post page

I’m trying to use more of the prebuilt pages/post pages for my website.

I have installed one of the single post pages and have customized it for my use. The one thing I’m struggling with is using the different sidebars.

Currently, I have sidebars for different categories (my category is baseball, so I have a baseball sidebar; if the category is football, I use the football sidebar).

Using my newly created page, I add the widget sidebar but if I don’t add widgets, nothing shows up. If I add widgets, only the widgets Created on the custom page appear and not the individual sidebars that I have assigned to categories.

How can I get those custom sidebars to appear on the correct category post?

Thank you.