Assign a second theme to a blog

I have two themes, the main one for the site, and a second theme that is for another area. The blog apps that use the main theme, I just created and they loaded the layout as default, but I now need to create a blog app that uses a second theme that is not the default, and I can't assign the second theme to a blog. I tried creating the link in Joomla's menu management, and assigning the theme to the menu link, but it still didn't work. I also looked on the blog's single page to see if I could change the theme, but I only found the theme button to modify the default theme. Thanks a lot for the help.

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