Issue with "Blog Single Post Layout" theme

Hello support team,
I recently changed the blog theme in the Settings > General tab.
While the new theme is working correctly on the "Category List Layout" page, the "Single Post Layout" is still using the previous theme. I can't seem to find the option to update it.
Could you please tell me how to apply the new theme to the "Single Post Layout"?
Thanks in advance for your help.
Best regards,

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