How to disable WordPress blog folder

To clarify, /blog and /blog/ are the same. The slash is added by the browser to properly structure the URL (best way I can explain it).

Your’re trying to access two different pages with the /blog/ slug. In this case, WordPress is overriding the blog link from your existing website and showing content from there.

What you’ll need to do is set your WordPress site to a different location other than /blog/, such as:

myWebsite.com/wordpress/

Then, you will want to prevent unauthorized access to your WordPress site if someone got ahold of the link. You can use a simple plugin such as Force Login which require visitors to log in order to interact with the website.