'How do I remove the "library root" setting from a directory?

I use RubyMine.

When I created a project, a directory was automatically set to the "library root" as shown below.
enter image description here

I would like to remove this library root, but I could not find a way to do so in my search.
(I also tried the method in the following article, but it did not solve my case)

The environment settings (project configuration) are as follows enter image description here

If you know how to unlock the LIBRARY route, I would appreciate it if you could let me know.



Solution 1:[1]

I was able to change it by modifying .idea/.??.iml

Sources

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Source: Stack Overflow

Solution Source
Solution 1 katahik